Fix .gitignore: stop tracking ignored files

2026-05-27 03:36:32 +00:00 · 2025-07-27 10:39:02 +05:30
parent b42747e9a3
commit 3a87ef0576
625 changed files with 88566 additions and 63 deletions
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.8.0) (crosschain/arbitrum/LibArbitrumL2.sol)
+
+pragma solidity ^0.8.4;
+
+import {IArbSys as ArbitrumL2_Bridge} from "../../vendor/arbitrum/IArbSys.sol";
+import "../errors.sol";
+
+/**
+ * @dev Primitives for cross-chain aware contracts for
+ * https://arbitrum.io/[Arbitrum].
+ *
+ * This version should only be used on L2 to process cross-chain messages
+ * originating from L1. For the other side, use {LibArbitrumL1}.
+ *
+ * WARNING: There is currently a bug in Arbitrum that causes this contract to
+ * fail to detect cross-chain calls when deployed behind a proxy. This will be
+ * fixed when the network is upgraded to Arbitrum Nitro, currently scheduled for
+ * August 31st 2022.
+ */
+library LibArbitrumL2 {
+    /**
+     * @dev Returns whether the current function call is the result of a
+     * cross-chain message relayed by `arbsys`.
+     */
+    address public constant ARBSYS = 0x0000000000000000000000000000000000000064;
+
+    function isCrossChain(address arbsys) internal view returns (bool) {
+        return ArbitrumL2_Bridge(arbsys).wasMyCallersAddressAliased();
+    }
+
+    /**
+     * @dev Returns the address of the sender that triggered the current
+     * cross-chain message through `arbsys`.
+     *
+     * NOTE: {isCrossChain} should be checked before trying to recover the
+     * sender, as it will revert with `NotCrossChainCall` if the current
+     * function call is not the result of a cross-chain message.
+     */
+    function crossChainSender(address arbsys) internal view returns (address) {
+        if (!isCrossChain(arbsys)) revert NotCrossChainCall();
+
+        return ArbitrumL2_Bridge(arbsys).myCallersAddressWithoutAliasing();
+    }
+}