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[NES-254] add adapter contract for pUSD (#96)
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| // SPDX-License-Identifier: MIT | ||
| pragma solidity ^0.8.25; | ||
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| import { AccessControlUpgradeable } from "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol"; | ||
| import { Initializable } from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol"; | ||
| import { UUPSUpgradeable } from "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol"; | ||
| import { ERC20Upgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol"; | ||
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| import { SafeTransferLib } from "@solmate/utils/SafeTransferLib.sol"; | ||
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| interface IVault { | ||
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| function enter(address from, address asset, uint256 assetAmount, address to, uint256 shareAmount) external; | ||
| function exit(address to, address asset, uint256 assetAmount, address from, uint256 shareAmount) external; | ||
| function transferFrom(address from, address to, uint256 amount) external returns (bool); | ||
| function approve(address spender, uint256 amount) external returns (bool); | ||
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| } | ||
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| /** | ||
| * @title pUSD | ||
| * @author Eugene Y. Q. Shen, Alp Guneysel | ||
| * @notice Unified Plume USD stablecoin | ||
| */ | ||
| contract PUSD is Initializable, ERC20Upgradeable, AccessControlUpgradeable, UUPSUpgradeable { | ||
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| using SafeTransferLib for ERC20; | ||
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| // ========== ROLES ========== | ||
| bytes32 public constant UPGRADER_ROLE = keccak256("UPGRADER_ROLE"); | ||
| bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE"); | ||
| bytes32 public constant BURNER_ROLE = keccak256("BURNER_ROLE"); | ||
| bytes32 public constant VAULT_ADMIN_ROLE = keccak256("VAULT_ADMIN_ROLE"); | ||
| bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE"); | ||
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| // ========== STATE VARIABLES ========== | ||
| IVault public vault; | ||
| bool public paused; | ||
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| // ========== EVENTS ========== | ||
| event VaultChanged(address oldVault, address newVault); | ||
| event Paused(address account); | ||
| event Unpaused(address account); | ||
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| // ========== MODIFIERS ========== | ||
| modifier whenNotPaused() { | ||
| require(!paused, "PUSD: paused"); | ||
| _; | ||
| } | ||
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| // ========== CONSTRUCTOR & INITIALIZER ========== | ||
| /// @custom:oz-upgrades-unsafe-allow constructor | ||
| constructor() { | ||
| _disableInitializers(); | ||
| } | ||
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| function initialize(address _vault, address admin) external initializer { | ||
| __ERC20_init("", ""); // Empty strings since we override name() and symbol() | ||
| __AccessControl_init(); | ||
| __UUPSUpgradeable_init(); | ||
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| vault = IVault(_vault); | ||
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| _grantRole(DEFAULT_ADMIN_ROLE, admin); | ||
| _grantRole(UPGRADER_ROLE, admin); | ||
| _grantRole(MINTER_ROLE, admin); | ||
| _grantRole(BURNER_ROLE, admin); | ||
| _grantRole(VAULT_ADMIN_ROLE, admin); | ||
| _grantRole(PAUSER_ROLE, admin); | ||
| } | ||
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| // ========== METADATA OVERRIDES ========== | ||
| function decimals() public pure override returns (uint8) { | ||
| return 6; | ||
| } | ||
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| function name() public pure override returns (string memory) { | ||
| return "Plume USD"; | ||
| } | ||
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| function symbol() public pure override returns (string memory) { | ||
| return "pUSD"; | ||
| } | ||
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| // ========== ADMIN FUNCTIONS ========== | ||
| function setVault( | ||
| address newVault | ||
| ) external onlyRole(VAULT_ADMIN_ROLE) { | ||
| address oldVault = address(vault); | ||
| vault = IVault(newVault); | ||
| emit VaultChanged(oldVault, newVault); | ||
| } | ||
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| function pause() external onlyRole(PAUSER_ROLE) { | ||
| paused = true; | ||
| emit Paused(msg.sender); | ||
| } | ||
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| function unpause() external onlyRole(PAUSER_ROLE) { | ||
| paused = false; | ||
| emit Unpaused(msg.sender); | ||
| } | ||
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| // Required override for UUPSUpgradeable | ||
| function _authorizeUpgrade( | ||
| address newImplementation | ||
| ) internal override onlyRole(UPGRADER_ROLE) { } | ||
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| // ========== ERC20 OVERRIDES ========== | ||
| function transfer(address to, uint256 amount) public override whenNotPaused returns (bool) { | ||
| return vault.transferFrom(msg.sender, to, amount); | ||
| } | ||
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| function transferFrom(address from, address to, uint256 amount) public override whenNotPaused returns (bool) { | ||
| return vault.transferFrom(from, to, amount); | ||
| } | ||
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| function approve(address spender, uint256 amount) public override whenNotPaused returns (bool) { | ||
| bool success = super.approve(spender, amount); | ||
| vault.approve(spender, amount); | ||
| return success; | ||
| } | ||
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| function balanceOf( | ||
| address account | ||
| ) public view override returns (uint256) { | ||
| return vault.balanceOf(account); | ||
| } | ||
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| // ========== INTERFACE SUPPORT ========== | ||
| function supportsInterface( | ||
| bytes4 interfaceId | ||
| ) public view override(AccessControlUpgradeable) returns (bool) { | ||
| return super.supportsInterface(interfaceId); | ||
| } | ||
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| } |