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| 1 | +// SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | +pragma solidity ^0.8; |
| 3 | + |
| 4 | +import {IEVC} from "evc/EthereumVaultConnector.sol"; |
| 5 | +import {IGPv2Authentication} from "./vendor/interfaces/IGPv2Authentication.sol"; |
| 6 | + |
| 7 | +import {GPv2Signing, IERC20, GPv2Trade} from "cow/mixins/GPv2Signing.sol"; |
| 8 | +import {GPv2Wrapper,GPv2Interaction} from "cow/GPv2Wrapper.sol"; |
| 9 | + |
| 10 | +/// @title CowEvcWrapper |
| 11 | +/// @notice A wrapper around the EVC that allows for settlement operations |
| 12 | +contract CowEvcWrapper is GPv2Wrapper, GPv2Signing { |
| 13 | + IEVC public immutable EVC; |
| 14 | + |
| 15 | + /// @notice 0 = not executing, 1 = wrappedSettle() called and not yet internal settle, 2 = evcInternalSettle() called |
| 16 | + uint256 public transient settleState; |
| 17 | + |
| 18 | + error Unauthorized(address msgSender); |
| 19 | + error NoReentrancy(); |
| 20 | + error MultiplePossibleReceivers( |
| 21 | + address resolvedVault, address resolvedSender, address secondVault, address secondSender |
| 22 | + ); |
| 23 | + |
| 24 | + error NotEVCSettlement(); |
| 25 | + |
| 26 | + constructor(address _evc, address payable _settlement) GPv2Wrapper(_settlement) { |
| 27 | + EVC = IEVC(_evc); |
| 28 | + } |
| 29 | + |
| 30 | + struct ResolvedValues { |
| 31 | + address vault; |
| 32 | + address sender; |
| 33 | + uint256 minAmount; |
| 34 | + } |
| 35 | + |
| 36 | + /// @notice Implementation of GPv2Wrapper._wrap - executes EVC operations around settlement |
| 37 | + /// @param tokens Tokens involved in settlement |
| 38 | + /// @param clearingPrices Clearing prices for settlement |
| 39 | + /// @param trades Trade data for settlement |
| 40 | + /// @param interactions Interaction data for settlement |
| 41 | + /// @param wrapperData Additional data for the wrapper (unused in this implementation) |
| 42 | + function _wrap( |
| 43 | + IERC20[] calldata tokens, |
| 44 | + uint256[] calldata clearingPrices, |
| 45 | + GPv2Trade.Data[] calldata trades, |
| 46 | + GPv2Interaction.Data[][3] calldata interactions, |
| 47 | + bytes calldata wrapperData |
| 48 | + ) internal override { |
| 49 | + // prevent reentrancy: there is no reason why we would want to allow it here |
| 50 | + if (settleState != 0) { |
| 51 | + revert NoReentrancy(); |
| 52 | + } |
| 53 | + settleState = 1; |
| 54 | + |
| 55 | + // Decode wrapperData into pre and post settlement actions |
| 56 | + (IEVC.BatchItem[] memory preSettlementItems, IEVC.BatchItem[] memory postSettlementItems) = |
| 57 | + abi.decode(wrapperData, (IEVC.BatchItem[], IEVC.BatchItem[])); |
| 58 | + IEVC.BatchItem[] memory items = new IEVC.BatchItem[](preSettlementItems.length + postSettlementItems.length + 1); |
| 59 | + |
| 60 | + // Copy pre-settlement items |
| 61 | + for (uint256 i = 0; i < preSettlementItems.length; i++) { |
| 62 | + items[i] = preSettlementItems[i]; |
| 63 | + } |
| 64 | + |
| 65 | + // Add settlement call to wrapper - use _internalSettle from GPv2Wrapper |
| 66 | + items[preSettlementItems.length] = IEVC.BatchItem({ |
| 67 | + onBehalfOfAccount: msg.sender, |
| 68 | + targetContract: address(this), |
| 69 | + value: 0, |
| 70 | + data: abi.encodeCall(this.evcInternalSettle, (tokens, clearingPrices, trades, interactions)) |
| 71 | + }); |
| 72 | + |
| 73 | + // Copy post-settlement items |
| 74 | + for (uint256 i = 0; i < postSettlementItems.length; i++) { |
| 75 | + items[preSettlementItems.length + 1 + i] = postSettlementItems[i]; |
| 76 | + } |
| 77 | + |
| 78 | + // Execute all items in a single batch |
| 79 | + EVC.batch(items); |
| 80 | + settleState = 0; |
| 81 | + } |
| 82 | + |
| 83 | + /// @notice Internal settlement function called by EVC |
| 84 | + /// @param tokens Tokens involved in settlement |
| 85 | + /// @param clearingPrices Clearing prices for settlement |
| 86 | + /// @param trades Trade data for settlement |
| 87 | + /// @param interactions Interaction data for settlement |
| 88 | + function evcInternalSettle( |
| 89 | + IERC20[] calldata tokens, |
| 90 | + uint256[] calldata clearingPrices, |
| 91 | + GPv2Trade.Data[] calldata trades, |
| 92 | + GPv2Interaction.Data[][3] calldata interactions |
| 93 | + ) external payable { |
| 94 | + if (msg.sender != address(EVC)) { |
| 95 | + revert Unauthorized(msg.sender); |
| 96 | + } |
| 97 | + |
| 98 | + if (settleState != 1) { |
| 99 | + // origSender will be address(0) here which indiates that internal settle was called when it shouldn't be (outside of wrappedSettle call) |
| 100 | + revert Unauthorized(address(0)); |
| 101 | + } |
| 102 | + |
| 103 | + settleState = 2; |
| 104 | + |
| 105 | + // Use GPv2Wrapper's _internalSettle to call the settlement contract |
| 106 | + _internalSettle(tokens, clearingPrices, trades, interactions); |
| 107 | + } |
| 108 | +} |
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