contracts-bedrock: poc OptimismSystemConfig

packages/contracts-bedrock/contracts/L1/OptimismSystemConfig.sol

@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
+
+import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
+import { Semver } from "../universal/Semver.sol";
+import { L2OutputOracle } from "./L2OutputOracle.sol";
+
+contract OptimismSystemConfig is Ownable, Semver {
+
+    L2OutputOracle immutable public l2OutputOracle;
+    address public unsafeBlockSigner;
+
+    event SetBatcher(address indexed batcher);
+    event SetUnsafeBlockSigner(address indexed previous, address indexed next);
+
+    constructor(
+        L2OutputOracle _l2OutputOracle,
+        address _unsafeBlockSigner
+    ) Semver(0, 0, 1) {
+        unsafeBlockSigner = _unsafeBlockSigner;
+        l2OutputOracle = _l2OutputOracle;
+    }
+
+    function safeBlockSigner() external view returns (address) {
+        return l2OutputOracle.proposer();
+    }
+
+    function setBatcher(address batcher) onlyOwner external {
+        emit SetBatcher(batcher);
+    }
+
+    function setUnsafeBlockSigner(address _unsafeBlockSigner) onlyOwner external {
+        address prev = unsafeBlockSigner;
+        unsafeBlockSigner = _unsafeBlockSigner;
+        emit SetUnsafeBlockSigner(prev, _unsafeBlockSigner);
+    }
+}