Merge pull request #50 from connext/blast-lockbox-adapter

Blast lockbox adapter

contracts/integration/LockboxAdapterBlast.sol

@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.13;
+
+import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import {IXERC20} from "../shared/IXERC20/IXERC20.sol";
+import {IXERC20Lockbox} from "../shared/IXERC20/IXERC20Lockbox.sol";
+
+interface IXERC20Registry {
+  function getXERC20(address erc20) external view returns (address xerc20);
+
+  function getERC20(address xerc20) external view returns (address erc20);
+
+  function getLockbox(address erc20) external view returns (address xerc20);
+}
+
+interface L1StandardBridge {
+  function bridgeERC20To(
+    address _localToken,
+    address _remoteToken,
+    address _to,
+    uint256 _amount,
+    uint32 _minGasLimit,
+    bytes calldata _extraData
+  ) external;
+}
+
+/// @notice This adapter is only used for sending assets from Ethereum mainnet to Blast.
+/// @dev Combines Lockbox deposit and Blast bridge's BridgeERC20 call.
+contract LockboxAdapterBlast {
+  address immutable blastStandardBridge;
+  address immutable registry;
+
+  // ERRORS
+  error AmountLessThanZero();
+
+  constructor(address _blastStandardBridge, address _registry) {
+    blastStandardBridge = _blastStandardBridge;
+    registry = _registry;
+  }
+
+  /// @dev Combines Lockbox deposit and Blast bridge's BridgeERC20To call.
+  /// @param _to The recipient or contract address on destination.
+  /// @param _erc20 The address of the adopted ERC20 on the origin chain.
+  /// @param _remoteToken The address of the asset to be received on the destination chain.
+  /// @param _amount The amount of asset to bridge.
+  /// @param _minGasLimit Minimum amount of gas that the bridge can be relayed with.
+  /// @param _extraData Extra data to be sent with the transaction.
+  function bridgeTo(
+    address _to,
+    address _erc20,
+    address _remoteToken,
+    uint256 _amount,
+    uint32 _minGasLimit,
+    bytes calldata _extraData
+  ) external {
+    if (_amount <= 0) {
+      revert AmountLessThanZero();
+    }
+
+    address xerc20 = IXERC20Registry(registry).getXERC20(_erc20);
+    address lockbox = IXERC20Registry(registry).getLockbox(xerc20);
+
+    SafeERC20.safeTransferFrom(IERC20(_erc20), msg.sender, address(this), _amount);
+    IERC20(_erc20).approve(lockbox, _amount);
+    IXERC20Lockbox(lockbox).deposit(_amount);
+    IERC20(xerc20).approve(blastStandardBridge, _amount);
+    L1StandardBridge(blastStandardBridge).bridgeERC20To(xerc20, _remoteToken, _to, _amount, _minGasLimit, _extraData);
+  }
+}

script/DeployLockboxAdapterBlast.s.sol

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+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.13;
+
+import "forge-std/Script.sol";
+import {LockboxAdapterBlast} from "../contracts/integration/LockboxAdapterBlast.sol";
+
+contract DeployLockboxAdapterBlast is Script {
+  function run() public {
+    vm.startBroadcast();
+
+    new LockboxAdapterBlast(
+      address(0x697402166Fbf2F22E970df8a6486Ef171dbfc524), // blastStandardBridge
+      address(0xBf29A2D67eFb6766E44c163B19C6F4118b164702) // registry
+    );
+
+    vm.stopBroadcast();
+  }
+}