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84 lines
2.6 KiB
Solidity
84 lines
2.6 KiB
Solidity
2 years ago
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// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
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pragma solidity ^0.8.0;
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import "../utils/Context.sol";
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/**
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* @dev Contract module which provides a basic 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}.
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*
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* This module is used through inheritance. It will make available the modifier
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* `onlyOwner`, which can be applied to your functions to restrict their use to
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* the owner.
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*/
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abstract contract Ownable is Context {
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address private _owner;
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event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
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/**
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* @dev Initializes the contract setting the deployer as the initial owner.
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*/
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constructor() {
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_transferOwnership(_msgSender());
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}
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/**
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* @dev Throws if called by any account other than the owner.
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*/
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modifier onlyOwner() {
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_checkOwner();
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_;
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}
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/**
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* @dev Returns the address of the current owner.
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*/
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function owner() public view virtual returns (address) {
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return _owner;
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}
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/**
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* @dev Throws if the sender is not the owner.
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*/
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function _checkOwner() internal view virtual {
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require(owner() == _msgSender(), "Ownable: caller is not the owner");
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}
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/**
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* @dev Leaves the contract without owner. It will not be possible to call
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* `onlyOwner` functions anymore. Can only be called by the current owner.
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*
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* NOTE: Renouncing ownership will leave the contract without an owner,
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* thereby removing any functionality that is only available to the owner.
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*/
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function renounceOwnership() public virtual onlyOwner {
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_transferOwnership(address(0));
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}
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/**
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* @dev Transfers ownership of the contract to a new account (`newOwner`).
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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 onlyOwner {
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require(newOwner != address(0), "Ownable: new owner is the zero address");
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_transferOwnership(newOwner);
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}
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/**
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* @dev Transfers ownership of the contract to a new account (`newOwner`).
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* Internal function without access restriction.
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*/
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function _transferOwnership(address newOwner) internal virtual {
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address oldOwner = _owner;
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_owner = newOwner;
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emit OwnershipTransferred(oldOwner, newOwner);
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}
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}
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