83 lines
2.4 KiB
Solidity
83 lines
2.4 KiB
Solidity
pragma solidity >=0.5.0 <0.6.0;
|
|
|
|
|
|
/**
|
|
* @title Ownable
|
|
* @dev The Ownable contract has an owner address, and provides basic authorization control
|
|
* functions, this simplifies the implementation of "user permissions".
|
|
*/
|
|
contract Ownable {
|
|
address private _owner;
|
|
|
|
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
|
|
|
|
/**
|
|
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
|
|
* account.
|
|
*/
|
|
constructor () internal {
|
|
_owner = msg.sender;
|
|
emit OwnershipTransferred(address(0), _owner);
|
|
}
|
|
|
|
/**
|
|
* @dev is sender the owner of the contract?
|
|
* @return true if `msg.sender` is the owner of the contract.
|
|
*/
|
|
function isOwner() public view returns (bool) {
|
|
return msg.sender == _owner;
|
|
}
|
|
|
|
/**
|
|
* @dev Throws if called by any account other than the owner.
|
|
*/
|
|
modifier onlyOwner() {
|
|
require(isOwner(), "Only the contract's owner can invoke this function");
|
|
_;
|
|
}
|
|
|
|
/**
|
|
* @dev Allows the current owner to relinquish control of the contract.
|
|
* Renouncing to ownership will leave the contract without an owner.
|
|
* It will not be possible to call the functions with the `onlyOwner`
|
|
* modifier anymore.
|
|
*/
|
|
function renounceOwnership() external onlyOwner {
|
|
emit OwnershipTransferred(_owner, address(0));
|
|
_owner = address(0);
|
|
}
|
|
|
|
/**
|
|
* @dev Allows the current owner to transfer control of the contract to a newOwner.
|
|
* @param _newOwner The address to transfer ownership to.
|
|
*/
|
|
function transferOwnership(address _newOwner) external onlyOwner {
|
|
_transferOwnership(_newOwner);
|
|
}
|
|
|
|
/**
|
|
* @dev Get the contract's owner
|
|
* @return the address of the owner.
|
|
*/
|
|
function owner() public view returns (address) {
|
|
return _owner;
|
|
}
|
|
|
|
/**
|
|
* @dev Transfers control of the contract to a newOwner.
|
|
* @param _newOwner The address to transfer ownership to.
|
|
*/
|
|
function _transferOwnership(address _newOwner) internal {
|
|
require(_newOwner != address(0), "New owner cannot be address(0)");
|
|
emit OwnershipTransferred(_owner, _newOwner);
|
|
_owner = _newOwner;
|
|
}
|
|
|
|
/**
|
|
* @dev Sets an owner address
|
|
* @param _newOwner new owner address
|
|
*/
|
|
function _setOwner(address _newOwner) internal {
|
|
_owner = _newOwner;
|
|
}
|
|
} |