112 lines
3.9 KiB
Solidity
112 lines
3.9 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.5.0-rc.0) (token/ERC20/presets/ERC20PresetMinterPauser.sol)
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pragma solidity ^0.8.0;
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import "../ERC20Upgradeable.sol";
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import "../extensions/ERC20BurnableUpgradeable.sol";
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import "../extensions/ERC20PausableUpgradeable.sol";
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import "../../../access/AccessControlEnumerableUpgradeable.sol";
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import "../../../utils/ContextUpgradeable.sol";
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import "../../../proxy/utils/Initializable.sol";
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/**
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* @dev {ERC20} token, including:
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*
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* - ability for holders to burn (destroy) their tokens
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* - a minter role that allows for token minting (creation)
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* - a pauser role that allows to stop all token transfers
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*
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* This contract uses {AccessControl} to lock permissioned functions using the
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* different roles - head to its documentation for details.
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*
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* The account that deploys the contract will be granted the minter and pauser
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* roles, as well as the default admin role, which will let it grant both minter
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* and pauser roles to other accounts.
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*
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* _Deprecated in favor of https://wizard.openzeppelin.com/[Contracts Wizard]._
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*/
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contract ERC20PresetMinterPauserUpgradeable is Initializable, ContextUpgradeable, AccessControlEnumerableUpgradeable, ERC20BurnableUpgradeable, ERC20PausableUpgradeable {
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function initialize(string memory name, string memory symbol) public virtual initializer {
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__ERC20PresetMinterPauser_init(name, symbol);
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}
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bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
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bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");
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/**
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* @dev Grants `DEFAULT_ADMIN_ROLE`, `MINTER_ROLE` and `PAUSER_ROLE` to the
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* account that deploys the contract.
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*
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* See {ERC20-constructor}.
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*/
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function __ERC20PresetMinterPauser_init(string memory name, string memory symbol) internal onlyInitializing {
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__ERC20_init_unchained(name, symbol);
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__Pausable_init_unchained();
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__ERC20PresetMinterPauser_init_unchained(name, symbol);
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}
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function __ERC20PresetMinterPauser_init_unchained(string memory, string memory) internal onlyInitializing {
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_setupRole(DEFAULT_ADMIN_ROLE, _msgSender());
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_setupRole(MINTER_ROLE, _msgSender());
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_setupRole(PAUSER_ROLE, _msgSender());
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}
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/**
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* @dev Creates `amount` new tokens for `to`.
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*
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* See {ERC20-_mint}.
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*
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* Requirements:
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*
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* - the caller must have the `MINTER_ROLE`.
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*/
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function mint(address to, uint256 amount) public virtual {
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require(hasRole(MINTER_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have minter role to mint");
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_mint(to, amount);
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}
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/**
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* @dev Pauses all token transfers.
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*
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* See {ERC20Pausable} and {Pausable-_pause}.
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*
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* Requirements:
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*
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* - the caller must have the `PAUSER_ROLE`.
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*/
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function pause() public virtual {
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require(hasRole(PAUSER_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have pauser role to pause");
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_pause();
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}
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/**
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* @dev Unpauses all token transfers.
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*
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* See {ERC20Pausable} and {Pausable-_unpause}.
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*
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* Requirements:
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*
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* - the caller must have the `PAUSER_ROLE`.
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*/
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function unpause() public virtual {
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require(hasRole(PAUSER_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have pauser role to unpause");
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_unpause();
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}
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function _beforeTokenTransfer(
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address from,
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address to,
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uint256 amount
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) internal virtual override(ERC20Upgradeable, ERC20PausableUpgradeable) {
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super._beforeTokenTransfer(from, to, amount);
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}
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/**
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* This empty reserved space is put in place to allow future versions to add new
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* variables without shifting down storage in the inheritance chain.
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* See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
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*/
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uint256[50] private __gap;
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}
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