RethExchangeRateAdapter

{"IRocketTokenRETH.sol":{"content":"// SPDX-License-Identifier: GPL-2.0-or-later\r
pragma solidity ^0.8.21;\r
\r
interface IRocketTokenRETH {\r
    function getExchangeRate() external view returns (uint256);\r
}\r
"},"MinimalAggregatorV3Interface.sol":{"content":"// SPDX-License-Identifier: GPL-2.0-or-later\r
pragma solidity ^0.8.21;\r
\r
interface MinimalAggregatorV3Interface {\r
    function decimals() external view returns (uint8);\r
    function description() external view returns (string memory);\r
    function version() external view returns (uint256);\r
    function latestRoundData()\r
        external\r
        view\r
        returns (\r
            uint80 roundId,\r
            int256 answer,\r
            uint256 startedAt,\r
            uint256 updatedAt,\r
            uint80 answeredInRound\r
        );\r
}"},"RethExchangeRateAdapter.sol":{"content":"// SPDX-License-Identifier: GPL-2.0-or-later\r
pragma solidity ^0.8.21;\r
\r
import {IRocketTokenRETH} from "./IRocketTokenRETH.sol";\r
import {MinimalAggregatorV3Interface} from "./MinimalAggregatorV3Interface.sol";\r
\r
/// @title rETH Exchange Rate Adapter\r
/// @notice rETH/ETH exchange rate Chainlink-compatible adapter\r
/// @dev Adapter for Rocket Pool rETH getExchangeRate() to Chainlink format\r
contract RethExchangeRateAdapter is MinimalAggregatorV3Interface {\r
    uint8 public constant override decimals = 18;\r
    string public constant override description = "rETH/ETH exchange rate adapter";\r
    uint256 public constant override version = 1;\r
    \r
    IRocketTokenRETH public immutable rETH;\r
    \r
    constructor() {\r
        rETH = IRocketTokenRETH(0xae78736Cd615f374D3085123A210448E74Fc6393);\r
    }\r
    \r
    function latestRoundData()\r
        external\r
        view\r
        override\r
        returns (\r
            uint80 roundId,\r
            int256 answer,\r
            uint256 startedAt,\r
            uint256 updatedAt,\r
            uint80 answeredInRound\r
        )\r
    {\r
        uint256 exchangeRate = rETH.getExchangeRate();\r
        \r
        // Ensure the rate is valid and within reasonable bounds\r
        require(exchangeRate \u003e 0, "Invalid exchange rate");\r
        require(exchangeRate \u003c= type(uint192).max, "Exchange rate too large");\r
        \r
        return (\r
            0,                    // roundId - not applicable for this oracle\r
            int256(exchangeRate), // answer - rETH/ETH rate in 18 decimals\r
            0,                    // startedAt - not applicable\r
            block.timestamp,      // updatedAt - current block time\r
            0                     // answeredInRound - not applicable\r
        );\r
    }\r
}\r
"}}