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