flETH

[
  {
    "inputs": [
      {
        "internalType": "contract IWETH",
        "name": "weth_",
        "type": "address"
      },
      {
        "internalType": "address",
        "name": "yieldReceiver_",
        "type": "address"
      }
    ],
    "stateMutability": "nonpayable",
    "type": "constructor"
  },
  {
    "inputs": [],
    "name": "AlreadyInitialized",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "AmountExceedsETHBalance",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "CurrentStrategyHasBalance",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "spender",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "allowance",
        "type": "uint256"
      },
      {
        "internalType": "uint256",
        "name": "needed",
        "type": "uint256"
      }
    ],
    "name": "ERC20InsufficientAllowance",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "sender",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "balance",
        "type": "uint256"
      },
      {
        "internalType": "uint256",
        "name": "needed",
        "type": "uint256"
      }
    ],
    "name": "ERC20InsufficientBalance",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "approver",
        "type": "address"
      }
    ],
    "name": "ERC20InvalidApprover",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "receiver",
        "type": "address"
      }
    ],
    "name": "ERC20InvalidReceiver",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "sender",
        "type": "address"
      }
    ],
    "name": "ERC20InvalidSender",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "spender",
        "type": "address"
      }
    ],
    "name": "ERC20InvalidSpender",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "NewOwnerIsZeroAddress",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "NoHandoverRequest",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "OnlySelf",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "RebalanceThresholdExceedsMax",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "Reentrancy",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "token",
        "type": "address"
      }
    ],
    "name": "SafeERC20FailedOperation",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "UnableToSendETH",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "Unauthorized",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "YieldReceiverIsZero",
    "type": "error"
  },
  {
    "anonymous": false,
    "inputs": [
      {
        "indexed": true,
        "internalType": "address",
        "name": "owner",
        "type": "address"
      },
      {
        "indexed": true,
        "internalType": "address",
        "name": "spender",
        "type": "address"
      },
      {
        "indexed": false,
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "Approval",
    "type": "event"
  },
  {
    "anonymous": false,
    "inputs": [
      {
        "indexed": true,
        "internalType": "address",
        "name": "pendingOwner",
        "type": "address"
      }
    ],
    "name": "OwnershipHandoverCanceled",
    "type": "event"
  },
  {
    "anonymous": false,
    "inputs": [
      {
        "indexed": true,
        "internalType": "address",
        "name": "pendingOwner",
        "type": "address"
      }
    ],
    "name": "OwnershipHandoverRequested",
    "type": "event"
  },
  {
    "anonymous": false,
    "inputs": [
      {
        "indexed": true,
        "internalType": "address",
        "name": "oldOwner",
        "type": "address"
      },
      {
        "indexed": true,
        "internalType": "address",
        "name": "newOwner",
        "type": "address"
      }
    ],
    "name": "OwnershipTransferred",
    "type": "event"
  },
  {
    "anonymous": false,
    "inputs": [
      {
        "indexed": false,
        "internalType": "uint256",
        "name": "amount",
        "type": "uint256"
      },
      {
        "indexed": false,
        "internalType": "bytes",
        "name": "reason",
        "type": "bytes"
      }
    ],
    "name": "StrategyFundingSkipped",
    "type": "event"
  },
  {
    "anonymous": false,
    "inputs": [
      {
        "indexed": true,
        "internalType": "address",
        "name": "from",
        "type": "address"
      },
      {
        "indexed": true,
        "internalType": "address",
        "name": "to",
        "type": "address"
      },
      {
        "indexed": false,
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "Transfer",
    "type": "event"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "owner",
        "type": "address"
      },
      {
        "internalType": "address",
        "name": "spender",
        "type": "address"
      }
    ],
    "name": "allowance",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "spender",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "approve",
    "outputs": [
      {
        "internalType": "bool",
        "name": "",
        "type": "bool"
      }
    ],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "account",
        "type": "address"
      }
    ],
    "name": "balanceOf",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "cancelOwnershipHandover",
    "outputs": [],
    "stateMutability": "payable",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "contract IFLETHStrategy",
        "name": "strategy_",
        "type": "address"
      }
    ],
    "name": "changeStrategy",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "pendingOwner",
        "type": "address"
      }
    ],
    "name": "completeOwnershipHandover",
    "outputs": [],
    "stateMutability": "payable",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "decimals",
    "outputs": [
      {
        "internalType": "uint8",
        "name": "",
        "type": "uint8"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "uint256",
        "name": "wethAmount",
        "type": "uint256"
      }
    ],
    "name": "deposit",
    "outputs": [],
    "stateMutability": "payable",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "uint256",
        "name": "amount",
        "type": "uint256"
      }
    ],
    "name": "emergencyRescue",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "harvest",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "name",
    "outputs": [
      {
        "internalType": "string",
        "name": "",
        "type": "string"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "owner",
    "outputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "pendingOwner",
        "type": "address"
      }
    ],
    "name": "ownershipHandoverExpiresAt",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "result",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "rebalance",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "rebalanceThreshold",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "renounceOwnership",
    "outputs": [],
    "stateMutability": "payable",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "requestOwnershipHandover",
    "outputs": [],
    "stateMutability": "payable",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "selfRebalance",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "uint256",
        "name": "rebalanceThreshold_",
        "type": "uint256"
      }
    ],
    "name": "setRebalanceThreshold",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "yieldReceiver_",
        "type": "address"
      }
    ],
    "name": "setYieldReceiver",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "strategy",
    "outputs": [
      {
        "internalType": "contract IFLStrategy",
        "name": "",
        "type": "address"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "symbol",
    "outputs": [
      {
        "internalType": "string",
        "name": "",
        "type": "string"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "totalSupply",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "to",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "transfer",
    "outputs": [
      {
        "internalType": "bool",
        "name": "",
        "type": "bool"
      }
    ],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "from",
        "type": "address"
      },
      {
        "internalType": "address",
        "name": "to",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "transferFrom",
    "outputs": [
      {
        "internalType": "bool",
        "name": "",
        "type": "bool"
      }
    ],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "newOwner",
        "type": "address"
      }
    ],
    "name": "transferOwnership",
    "outputs": [],
    "stateMutability": "payable",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "underlyingBalance",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "underlyingETHBalance",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "weth",
    "outputs": [
      {
        "internalType": "contract IWETH",
        "name": "",
        "type": "address"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "uint256",
        "name": "amount",
        "type": "uint256"
      }
    ],
    "name": "withdraw",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "yieldAccumulated",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "yieldReceiver",
    "outputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "stateMutability": "payable",
    "type": "receive"
  }
]

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.22;

import {ERC20} from '@openzeppelin/contracts/token/ERC20/ERC20.sol';
import {SafeERC20} from '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';

import {FLToken} from '@fleth/base/FLToken.sol';

import {IFLToken} from '@fleth-interfaces/IFLToken.sol';
import {IFLETH} from '@fleth-interfaces/IFLETH.sol';
import {IFLETHStrategy} from '@fleth-interfaces/IFLETHStrategy.sol';
import {IWETH} from '@fleth-interfaces/IWETH.sol';

/**
 * The flETH token. Wraps native ETH 1:1 on top of the shared {FLToken} vault logic.
 *
 *    ______/\\\\\__/\\\\\\_____/\\\\\\\\\\\\\\\__/\\\\\\\\\\\\\\\___/\\\________/\\\__________
 *    _____/\\\///__\////\\\____\/\\\///////////__\///////\\\/////___\/\\\_______\/\\\_________
 *    _____/\\\_________\/\\\____\/\\\___________________\/\\\________\/\\\_______\/\\\________
 *    ___/\\\\\\\\\______\/\\\____\/\\\\\\\\\\\___________\/\\\________\/\\\\\\\\\\\\\\\_______
 *    ___\////\\\//_______\/\\\____\/\\\///////____________\/\\\________\/\\\/////////\\\______
 *    _______\/\\\_________\/\\\____\/\\\___________________\/\\\________\/\\\_______\/\\\_____
 *    ________\/\\\_________\/\\\____\/\\\___________________\/\\\________\/\\\_______\/\\\____
 *    _________\/\\\_______/\\\\\\\\\_\/\\\\\\\\\\\\\\\_______\/\\\________\/\\\_______\/\\\___
 *    __________\///_______\/////////__\///////////////________\///_________\///________\///___
 *
 */
contract flETH is FLToken, IFLETH {
    using SafeERC20 for IWETH;

    /// The WETH token address
    IWETH public immutable override weth;

    /**
     * Set up our contract dependencies and initialise our flETH ERC20.
     *
     * @param weth_ The WETH token address
     * @param yieldReceiver_ The recipient address of yield
     */
    constructor(IWETH weth_, address yieldReceiver_) ERC20('flETH', 'flETH') FLToken(yieldReceiver_) {
        weth = weth_;
    }

    /**
     * Makes a deposit into the contract, taking ETH and/or WETH and returning flETH.
     *
     * @dev This function can receive ETH and will give an amount of flETH equal to ETH + WETH.
     *
     * @param wethAmount The amount of WETH to transfer into the function
     */
    function deposit(uint wethAmount) external payable override nonReentrant {
        uint ethToDeposit = msg.value;

        // If we have WETH specified, then transfer it into the contract and unwrap into ETH
        if (wethAmount != 0) {
            weth.safeTransferFrom(msg.sender, address(this), wethAmount);
            weth.withdraw(wethAmount);
            ethToDeposit += wethAmount;
        }

        _mintAndRebalance(msg.sender, ethToDeposit);
    }

    /**
     * Allows the strategy to be updated. Validates that there is no ETH currently held in the
     * strategy to prevent loss of ETH.
     *
     * @param strategy_ The new {IFLETHStrategy} strategy to be used
     */
    function changeStrategy(IFLETHStrategy strategy_) external override onlyOwner {
        _changeStrategy(strategy_);
    }

    /**
     * ETH-denominated alias of {underlyingBalance}, preserved for backwards compatibility.
     */
    function underlyingETHBalance() external view override returns (uint) {
        return underlyingBalance();
    }

    /**
     * Disambiguates the `owner()` inherited from both {FLToken} and {IFLToken}.
     */
    function owner() public view override (FLToken, IFLToken) returns (address) {
        return FLToken.owner();
    }

    /**
     * The raw ETH balance held directly by the contract.
     */
    function _heldBalance() internal view override returns (uint) {
        return address(this).balance;
    }

    /**
     * Transfers ETH to `to`, ensuring that the call is successful.
     */
    function _transferOut(address to, uint amount) internal override {
        (bool success,) = to.call{value: amount}('');
        if (!success) revert UnableToSendETH();
    }

    /**
     * Funds the strategy by pushing ETH with the call.
     */
    function _fundStrategy(uint amount) internal override {
        IFLETHStrategy(address(strategy)).convertETHToLST{value: amount}();
    }

    function _revertAmountExceedsBalance() internal pure override {
        revert AmountExceedsETHBalance();
    }

    /**
     * Receives ETH from contracts like WETH and the strategy.
     */
    receive() external payable {}
}