You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.3 KiB
75 lines
2.3 KiB
pragma solidity ^0.5.0;
|
|
|
|
/**
|
|
* @dev Contract module which provides a basic access control mechanism, where
|
|
* there is an account (an owner) that can be granted exclusive access to
|
|
* specific functions.
|
|
*
|
|
* This module is used through inheritance. It will make available the modifier
|
|
* `onlyOwner`, which can be applied to your functions to restrict their use to
|
|
* the owner.
|
|
*/
|
|
contract Ownable {
|
|
address private _owner;
|
|
|
|
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
|
|
|
|
/**
|
|
* @dev Initializes the contract setting the deployer as the initial owner.
|
|
*/
|
|
constructor () internal {
|
|
_owner = msg.sender;
|
|
emit OwnershipTransferred(address(0), _owner);
|
|
}
|
|
|
|
/**
|
|
* @dev Returns the address of the current owner.
|
|
*/
|
|
function owner() public view returns (address) {
|
|
return _owner;
|
|
}
|
|
|
|
/**
|
|
* @dev Throws if called by any account other than the owner.
|
|
*/
|
|
modifier onlyOwner() {
|
|
require(isOwner(), "Ownable: caller is not the owner");
|
|
_;
|
|
}
|
|
|
|
/**
|
|
* @dev Returns true if the caller is the current owner.
|
|
*/
|
|
function isOwner() public view returns (bool) {
|
|
return msg.sender == _owner;
|
|
}
|
|
|
|
/**
|
|
* @dev Leaves the contract without owner. It will not be possible to call
|
|
* `onlyOwner` functions anymore. Can only be called by the current owner.
|
|
*
|
|
* NOTE: Renouncing ownership will leave the contract without an owner,
|
|
* thereby removing any functionality that is only available to the owner.
|
|
*/
|
|
function renounceOwnership() public onlyOwner {
|
|
emit OwnershipTransferred(_owner, address(0));
|
|
_owner = address(0);
|
|
}
|
|
|
|
/**
|
|
* @dev Transfers ownership of the contract to a new account (`newOwner`).
|
|
* Can only be called by the current owner.
|
|
*/
|
|
function transferOwnership(address newOwner) public onlyOwner {
|
|
_transferOwnership(newOwner);
|
|
}
|
|
|
|
/**
|
|
* @dev Transfers ownership of the contract to a new account (`newOwner`).
|
|
*/
|
|
function _transferOwnership(address newOwner) internal {
|
|
require(newOwner != address(0), "Ownable: new owner is the zero address");
|
|
emit OwnershipTransferred(_owner, newOwner);
|
|
_owner = newOwner;
|
|
}
|
|
}
|
|
|