Merge pull request #82 from morpho-org/refactor/hardcode-steth

Hardcode stETH address

Author: MathisGD

src/wsteth-exchange-rate-adapter/WstEthEthExchangeRateChainlinkAdapter.sol

@@ -4,8 +4,6 @@ pragma solidity 0.8.21;
 import {IStEth} from "./interfaces/IStEth.sol";
 import {MinimalAggregatorV3Interface} from "./interfaces/MinimalAggregatorV3Interface.sol";
 
-import {ErrorsLib} from "./libraries/ErrorsLib.sol";
-
 /// @title WstEthEthExchangeRateChainlinkAdapter
 /// @author Morpho Labs
 /// @custom:contact security@morpho.org
@@ -15,14 +13,7 @@ contract WstEthEthExchangeRateChainlinkAdapter is MinimalAggregatorV3Interface {
     // @dev The calculated price has 18 decimals precision, whatever the value of `decimals`.
     uint8 public constant decimals = 18;
     string public constant description = "wstETH/ETH exchange rate";
-
-    IStEth public immutable ST_ETH;
-
-    constructor(address stEth) {
-        require(stEth != address(0), ErrorsLib.ZERO_ADDRESS);
-
-        ST_ETH = IStEth(stEth);
-    }
+    IStEth public constant ST_ETH = IStEth(0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84);
 
     /// @dev Silently overflows if `getPooledEthByShares`'s return value is greater than `type(int256).max`.
     function latestRoundData() external view returns (uint80, int256, uint256, uint256, uint80) {

src/wsteth-exchange-rate-adapter/libraries/ErrorsLib.sol

@@ -14,7 +14,7 @@ contract WstEthEthExchangeRateChainlinkAdapterTest is Test {
 
     function setUp() public {
         vm.createSelectFork(vm.envString("ETH_RPC_URL"));
-        oracle = new WstEthEthExchangeRateChainlinkAdapter(address(ST_ETH));
+        oracle = new WstEthEthExchangeRateChainlinkAdapter();
         chainlinkOracle = new ChainlinkOracle(
             vaultZero, AggregatorV3Interface(address(oracle)), feedZero, feedZero, feedZero, 1, 18, 18
         );
@@ -28,11 +28,6 @@ contract WstEthEthExchangeRateChainlinkAdapterTest is Test {
         assertEq(oracle.description(), "wstETH/ETH exchange rate");
     }
 
-    function testDeployZeroAddress() public {
-        vm.expectRevert(bytes(ErrorsLib.ZERO_ADDRESS));
-        new WstEthEthExchangeRateChainlinkAdapter(address(0));
-    }
-
     function testLatestRoundData() public {
         (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound) =
             oracle.latestRoundData();