feat: adding isValidSignature method scaffold

src/contracts/BPool.sol

@@ -16,8 +16,9 @@ pragma solidity 0.8.23;
 import './BMath.sol';
 import './BToken.sol';
 import 'interfaces/IBFactory.sol';
+import {IERC1271} from 'interfaces/IERC1271.sol';
 
-contract BPool is BBronze, BToken, BMath {
+contract BPool is IERC1271, BBronze, BToken, BMath {
   struct Record {
     bool bound; // is token bound to pool
     uint256 index; // internal
@@ -549,4 +550,8 @@ contract BPool is BBronze, BToken, BMath {
       IERC20(_tokens[i]).approve(_target, type(uint256).max);
     }
   }
+
+  function isValidSignature(bytes32, bytes memory) external pure override returns (bytes4 magicValue) {
+    return this.isValidSignature.selector;
+  }
 }

src/interfaces/IERC1271.sol

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC1271.sol)
+
+pragma solidity ^0.8.20;
+
+/**
+ * @dev Interface of the ERC-1271 standard signature validation method for
+ * contracts as defined in https://eips.ethereum.org/EIPS/eip-1271[ERC-1271].
+ */
+interface IERC1271 {
+  /**
+   * @dev Should return whether the signature provided is valid for the provided data
+   * @param hash      Hash of the data to be signed
+   * @param signature Signature byte array associated with _data
+   */
+  function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue);
+}