Contracts V2

contracts/.gitignore

@@ -12,7 +12,7 @@ coverage/
 out/
 cache/
 broadcast/
-types/
+/types/
 tsconfig.tsbuildinfo
 lcov.info
 tenderly.yaml

contracts/foundry.toml

@@ -20,3 +20,7 @@ via_ir = true
 
 [profile.production.etherscan]
 mainnet = { key = "${ETHERSCAN_API_KEY}" }
+
+[fmt]
+number_underscore = "thousands"
+line_length = 89

contracts/src/AgentExecutor.sol

@@ -27,6 +27,8 @@ contract AgentExecutor {
         _transferToken(token, recipient, amount);
     }
 
+    function deposit() external payable {}
+
     /// @dev Transfer ERC20 to `recipient`. Only callable via `execute`.
     function _transferToken(address token, address recipient, uint128 amount) internal {
         IERC20(token).safeTransfer(recipient, amount);

contracts/src/AssetsV2.sol

@@ -0,0 +1,196 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 Snowfork <[email protected]>
+pragma solidity 0.8.25;
+
+import {IERC20} from "./interfaces/IERC20.sol";
+import {IGateway} from "./interfaces/IGateway.sol";
+
+import {SafeTokenTransferFrom} from "./utils/SafeTransfer.sol";
+
+import {AssetsStorage, TokenInfo} from "./storage/AssetsStorage.sol";
+import {CoreStorage} from "./storage/CoreStorage.sol";
+
+import {SubstrateTypes} from "./SubstrateTypes.sol";
+import {ParaID, MultiAddress, Ticket, Costs, TransferKind, TicketV2} from "./Types.sol";
+import {Address} from "./utils/Address.sol";
+import {AgentExecutor} from "./AgentExecutor.sol";
+import {Agent} from "./Agent.sol";
+import {Call} from "./utils/Call.sol";
+import {Token} from "./Token.sol";
+import {WETH9} from "canonical-weth/WETH9.sol";
+
+/// @title Library for implementing Ethereum->Polkadot ERC20 transfers.
+library Assets {
+    using Address for address;
+    using SafeTokenTransferFrom for IERC20;
+
+    /* Errors */
+    error InvalidToken();
+    error InvalidAmount();
+    error InvalidDestination();
+    error TokenNotRegistered();
+    error Unsupported();
+    error InvalidDestinationFee();
+    error AgentDoesNotExist();
+    error TokenAlreadyRegistered();
+    error TokenMintFailed();
+    error TokenTransferFailed();
+
+    /*
+    *     _____   __________ .___          ____
+    *    /  _  \  \______   \|   | ___  __/_   |
+    *   /  /_\  \  |     ___/|   | \  \/ / |   |
+    *  /    |    \ |    |    |   |  \   /  |   |
+    *  \____|__  / |____|    |___|   \_/   |___|
+    *          \/
+    */
+
+    function isTokenRegistered(address token) external view returns (bool) {
+        return AssetsStorage.layout().tokenRegistry[token].isRegistered;
+    }
+
+    /// @dev transfer tokens from the sender to the specified agent
+    function _transferToAgent(
+        address agent,
+        address token,
+        address sender,
+        uint128 amount
+    ) internal {
+        if (!token.isContract()) {
+            revert InvalidToken();
+        }
+
+        if (amount == 0) {
+            revert InvalidAmount();
+        }
+
+        IERC20(token).safeTransferFrom(sender, agent, amount);
+    }
+
+    /// @dev Registers a token (only native tokens at this time)
+    /// @param token The ERC20 token address.
+    function registerToken(address token) external returns (TicketV2 memory ticket) {}
+
+    // @dev Register a new fungible Polkadot token for an agent
+    function registerForeignToken(
+        bytes32 foreignTokenID,
+        string memory name,
+        string memory symbol,
+        uint8 decimals
+    ) external {
+        AssetsStorage.Layout storage $ = AssetsStorage.layout();
+        if ($.tokenAddressOf[foreignTokenID] != address(0)) {
+            revert TokenAlreadyRegistered();
+        }
+        Token token = new Token(name, symbol, decimals);
+        TokenInfo memory info =
+            TokenInfo({isRegistered: true, foreignID: foreignTokenID});
+
+        $.tokenAddressOf[foreignTokenID] = address(token);
+        $.tokenRegistry[address(token)] = info;
+
+        emit IGateway.ForeignTokenRegistered(foreignTokenID, address(token));
+    }
+
+    // @dev Mint foreign token from Polkadot
+    function mintForeignToken(bytes32 foreignTokenID, address recipient, uint256 amount)
+        external
+    {
+        address token = _ensureTokenAddressOf(foreignTokenID);
+        Token(token).mint(recipient, amount);
+    }
+
+    // @dev Transfer ERC20 to `recipient`
+    function transferNativeToken(
+        address executor,
+        address agent,
+        address token,
+        address recipient,
+        uint128 amount
+    ) external {
+        bytes memory call =
+            abi.encodeCall(AgentExecutor.transferToken, (token, recipient, amount));
+        (bool success,) = Agent(payable(agent)).invoke(executor, call);
+        if (!success) {
+            revert TokenTransferFailed();
+        }
+    }
+
+    // @dev Get token address by tokenID
+    function tokenAddressOf(bytes32 tokenID) external view returns (address) {
+        AssetsStorage.Layout storage $ = AssetsStorage.layout();
+        return $.tokenAddressOf[tokenID];
+    }
+
+    // @dev Get token address by tokenID
+    function _ensureTokenAddressOf(bytes32 tokenID) internal view returns (address) {
+        AssetsStorage.Layout storage $ = AssetsStorage.layout();
+        if ($.tokenAddressOf[tokenID] == address(0)) {
+            revert TokenNotRegistered();
+        }
+        return $.tokenAddressOf[tokenID];
+    }
+
+    function _isTokenRegistered(address token) internal view returns (bool) {
+        AssetsStorage.Layout storage $ = AssetsStorage.layout();
+        return $.tokenRegistry[token].isRegistered;
+    }
+
+    /*
+    *     _____   __________ .___         ________
+    *    /  _  \  \______   \|   | ___  __\_____  \
+    *   /  /_\  \  |     ___/|   | \  \/ / /  ____/§
+    *  /    |    \ |    |    |   |  \   / /       \
+    *  \____|__  / |____|    |___|   \_/  \_______ \
+    *          \/                                 \/
+    */
+
+    function sendMessage(bytes calldata xcm, bytes[] calldata assets)
+        external
+        returns (TicketV2 memory)
+    {
+        AssetsStorage.Layout storage $ = AssetsStorage.layout();
+
+        bytes[] memory xfers = new bytes[](assets.length);
+        for (uint256 i = 0; i < assets.length; i++) {
+            xfers[i] = _handleAsset(assets[i]);
+        }
+
+        return TicketV2({costs: Costs({foreign: 0, native: 0}), xfers: xfers, xcm: xcm});
+    }
+
+    function _handleAsset(bytes calldata asset) internal returns (bytes memory) {
+        uint8 assetKind;
+        assembly {
+            assetKind := calldataload(asset.offset)
+        }
+        if (assetKind == 0) {
+            (, address token, uint128 amount) =
+                abi.decode(asset, (uint8, address, uint128));
+            return _handleAssetERC20(token, amount);
+        }
+    }
+
+    function _handleAssetERC20(address token, uint128 amount)
+        internal
+        returns (bytes memory)
+    {
+        AssetsStorage.Layout storage $ = AssetsStorage.layout();
+        TokenInfo storage info = $.tokenRegistry[token];
+
+        if (!info.isRegistered) {
+            revert TokenNotRegistered();
+        }
+
+        if (info.foreignID == bytes32(0)) {
+            _transferToAgent($.assetHubAgent, token, msg.sender, amount);
+            return
+                SubstrateTypes.encodeTransfer(TransferKind.LocalReserve, token, amount);
+        } else {
+            Token(token).burn(msg.sender, amount);
+            return SubstrateTypes.encodeTransfer(
+                TransferKind.DestinationReserve, token, amount
+            );
+        }
+    }
+}