feat: Add withdraw and swap paraswap adapter (#180)

* feat: withdraw and swap adapter * fix: rename method * fix: use safeTransfer * fix: updated comment * test: withdraw and swap * fix: feedback items
aave · Aug 22, 2023 · b7ead26 · b7ead26
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diff --git a/contracts/adapters/paraswap/ParaSwapWithdrawSwapAdapter.sol b/contracts/adapters/paraswap/ParaSwapWithdrawSwapAdapter.sol
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: AGPL-3.0
+pragma solidity ^0.8.10;
+
+import {IERC20Detailed} from '@aave/core-v3/contracts/dependencies/openzeppelin/contracts/IERC20Detailed.sol';
+import {IERC20WithPermit} from '@aave/core-v3/contracts/interfaces/IERC20WithPermit.sol';
+import {IPoolAddressesProvider} from '@aave/core-v3/contracts/interfaces/IPoolAddressesProvider.sol';
+import {BaseParaSwapSellAdapter} from './BaseParaSwapSellAdapter.sol';
+import {IParaSwapAugustusRegistry} from './interfaces/IParaSwapAugustusRegistry.sol';
+import {SafeERC20} from '@aave/core-v3/contracts/dependencies/openzeppelin/contracts/SafeERC20.sol';
+import {IParaSwapAugustus} from './interfaces/IParaSwapAugustus.sol';
+import {ReentrancyGuard} from '../../dependencies/openzeppelin/ReentrancyGuard.sol';
+
+contract ParaSwapWithdrawSwapAdapter is BaseParaSwapSellAdapter, ReentrancyGuard {
+  using SafeERC20 for IERC20Detailed;
+
+  constructor(
+    IPoolAddressesProvider addressesProvider,
+    IParaSwapAugustusRegistry augustusRegistry,
+    address owner
+  ) BaseParaSwapSellAdapter(addressesProvider, augustusRegistry) {
+    transferOwnership(owner);
+  }
+
+  function executeOperation(
+    address,
+    uint256,
+    uint256,
+    address,
+    bytes calldata
+  ) external override nonReentrant returns (bool) {
+    revert('NOT_SUPPORTED');
+  }
+
+  /**
+   * @dev Swaps an amount of an asset to another after a withdraw and transfers the new asset to the user.
+   * The user should give this contract allowance to pull the ATokens in order to withdraw the underlying asset and perform the swap.
+   * @param assetToSwapFrom Address of the underlying asset to be swapped from
+   * @param assetToSwapTo Address of the underlying asset to be swapped to
+   * @param amountToSwap Amount to be swapped, or maximum amount when swapping all balance
+   * @param minAmountToReceive Minimum amount to be received from the swap
+   * @param swapAllBalanceOffset Set to offset of fromAmount in Augustus calldata if wanting to swap all balance, otherwise 0
+   * @param swapCalldata Calldata for ParaSwap's AugustusSwapper contract
+   * @param augustus Address of ParaSwap's AugustusSwapper contract
+   * @param permitParams Struct containing the permit signatures, set to all zeroes if not used
+   */
+  function withdrawAndSwap(
+    IERC20Detailed assetToSwapFrom,
+    IERC20Detailed assetToSwapTo,
+    uint256 amountToSwap,
+    uint256 minAmountToReceive,
+    uint256 swapAllBalanceOffset,
+    bytes calldata swapCalldata,
+    IParaSwapAugustus augustus,
+    PermitSignature calldata permitParams
+  ) external nonReentrant {
+    IERC20WithPermit aToken = IERC20WithPermit(
+      _getReserveData(address(assetToSwapFrom)).aTokenAddress
+    );
+
+    if (swapAllBalanceOffset != 0) {
+      uint256 balance = aToken.balanceOf(msg.sender);
+      require(balance <= amountToSwap, 'INSUFFICIENT_AMOUNT_TO_SWAP');
+      amountToSwap = balance;
+    }
+
+    _pullATokenAndWithdraw(
+      address(assetToSwapFrom),
+      aToken,
+      msg.sender,
+      amountToSwap,
+      permitParams
+    );
+
+    uint256 amountReceived = _sellOnParaSwap(
+      swapAllBalanceOffset,
+      swapCalldata,
+      augustus,
+      assetToSwapFrom,
+      assetToSwapTo,
+      amountToSwap,
+      minAmountToReceive
+    );
+
+    assetToSwapTo.safeTransfer(msg.sender, amountReceived);
+  }
+}