Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.0;

import { IPriceSource } from "./interfaces/IPriceSource.sol";

interface IRocketPoolStakedEth {
    function getExchangeRate() external view returns (uint256);
}

/**
 *  @title RETHExchangeRateOracle
 *  @dev   Provides rETH / USD by multiplying the rETH exchange rate by ETH / USD.
 *         This provides a "non-market" price. Any depeg event will be ignored.
 */
contract RETHExchangeRateOracle {

    /// @notice RocketPool staked eth token contract.
    IRocketPoolStakedEth public immutable reth;

    /// @notice The price source for ETH / USD.
    IPriceSource public immutable ethSource;

    constructor(address _reth, address _ethSource) {
        // 8 decimals required as AaveOracle assumes this
        require(IPriceSource(_ethSource).decimals() == 8, "RETHExchangeRateOracle/invalid-decimals");
        
        reth      = IRocketPoolStakedEth(_reth);
        ethSource = IPriceSource(_ethSource);
    }

    function latestAnswer() external view returns (int256) {
        int256 ethUsd       = ethSource.latestAnswer();
        int256 exchangeRate = int256(reth.getExchangeRate());

        if (ethUsd <= 0 || exchangeRate <= 0) {
            return 0;
        }

        return exchangeRate * ethUsd / 1e18;
    }

    function decimals() external pure returns (uint8) {
        return 8;
    }

}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.0;

interface IPriceSource {
    function latestAnswer() external view returns (int256);
    function decimals() external view returns (uint8);
}

{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc20-helpers/=lib/erc20-helpers/src/",
    "forge-std/=lib/forge-std/src/",
    "sparklend-v1-core/=lib/sparklend-v1-core/contracts/",
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "sparklend-address-registry/=lib/sparklend-address-registry/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_reth","type":"address"},{"internalType":"address","name":"_ethSource","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"ethSource","outputs":[{"internalType":"contract IPriceSource","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"reth","outputs":[{"internalType":"contract IRocketPoolStakedEth","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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