From 5fbda4d1af1180a3ad7c4930581380b9af9e9e99 Mon Sep 17 00:00:00 2001
From: Ruhum <ruhum@proton.me>
Date: Sat, 18 May 2024 19:09:50 +0300
Subject: [PATCH] feat(bridger): add XLayer bridger

---
 script/crosschain/DeployXLayerBridger.s.sol | 30 +++++++++++
 vyper_contracts/bridgers/XLayerBridger.vy   | 60 +++++++++++++++++++++
 2 files changed, 90 insertions(+)
 create mode 100644 script/crosschain/DeployXLayerBridger.s.sol
 create mode 100644 vyper_contracts/bridgers/XLayerBridger.vy

diff --git a/script/crosschain/DeployXLayerBridger.s.sol b/script/crosschain/DeployXLayerBridger.s.sol
new file mode 100644
index 0000000..6efe433
--- /dev/null
+++ b/script/crosschain/DeployXLayerBridger.s.sol
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: AGPL-3.0
+pragma solidity ^0.8.13;
+
+import {CREATE3Script} from "../base/CREATE3Script.sol";
+import {VyperDeployer} from "../../src/lib/VyperDeployer.sol";
+
+contract DeployXLayerBridgerScript is CREATE3Script, VyperDeployer {
+    constructor() CREATE3Script(vm.envString("VERSION")) {}
+
+    function run() public returns (address bridger) {
+        uint256 deployerPrivateKey = uint256(vm.envBytes32("PRIVATE_KEY"));
+        vm.startBroadcast(deployerPrivateKey);
+
+        address xLayerMainnetBridge = 0x2a3DD3EB832aF982ec71669E178424b10Dca2EDe;
+        // 1 = XLayer testnet
+        // 3 = XLayer mainnet
+        // see https://www.okx.com/xlayer/docs/developer/build-on-xlayer/bridge-to-xlayer
+        uint32 networkId = 3;
+
+        bridger = createx.deployCreate3(
+            getCreate3ContractSalt("XLayerBridger"),
+            bytes.concat(
+                compileContract("bridgers/XLayerBridger"),
+                abi.encode(vm.envAddress("oVCX"), xLayerMainnetBridge, networkId)
+            )
+        );
+
+        vm.stopBroadcast();
+    }
+}
diff --git a/vyper_contracts/bridgers/XLayerBridger.vy b/vyper_contracts/bridgers/XLayerBridger.vy
new file mode 100644
index 0000000..648a2fa
--- /dev/null
+++ b/vyper_contracts/bridgers/XLayerBridger.vy
@@ -0,0 +1,60 @@
+# @version 0.3.7
+"""
+@title XLayer Bridge Wrapper
+"""
+from vyper.interfaces import ERC20
+
+interface XLayerBridge:
+    def bridgeAsset(_destinationNetwork: uint32, _destinationAddress: address, _amount: uint256, _token: address, _forceUpdateGlobalExitRoot: bool, permitData: Bytes[128]): payable
+
+TOKEN: immutable(address)
+XLAYER_BRIDGE: immutable(address)
+# 1 = XLayer testnet
+# 3 = XLayer mainnet
+# see https://www.okx.com/xlayer/docs/developer/build-on-xlayer/bridge-to-xlayer
+XLAYER_NETWORK_ID: immutable(uint32)
+
+is_approved: public(HashMap[address, bool])
+
+@external
+def __init__(_token: address, _xlayer_bridge: address, _xlayer_network_id: uint32):
+    TOKEN = _token
+    XLAYER_BRIDGE = _xlayer_bridge
+    XLAYER_NETWORK_ID = _xlayer_network_id
+
+    assert ERC20(_token).approve(_xlayer_bridge, max_value(uint256), default_return_value=True)
+    self.is_approved[_token] = True
+
+@external
+def bridge(_token: address, _to: address, _amount: uint256):
+    """
+    @notice Bridge a token to XLayer mainnet using the L1 Standard Bridge
+    @param _token The token to bridge
+    @param _to The address to deposit the token to on L2
+    @param _amount The amount of the token to deposit
+    """
+    assert ERC20(_token).transferFrom(msg.sender, self, _amount, default_return_value=True)
+    if _token != TOKEN and not self.is_approved[_token]:
+        assert ERC20(_token).approve(XLAYER_BRIDGE, max_value(uint256), default_return_value=True)
+        self.is_approved[_token] = True
+
+    XLayerBridge(XLAYER_BRIDGE).bridgeAsset(XLAYER_NETWORK_ID, _to, _amount, _token, True, b"")
+
+
+@pure
+@external
+def cost() -> uint256:
+    """
+    @notice Cost in OKB to bridge
+    """
+    return 0
+
+
+@pure
+@external
+def check(_account: address) -> bool:
+    """
+    @notice Check if `_account` may bridge via `transmit_emissions`
+    @param _account The account to check
+    """
+    return True
\ No newline at end of file