feat: [POST AUDIT] periphery contracts

contracts/external/interfaces/IERC20Auth.sol

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity ^0.8.0;
+
+/*
+ * @notice Minimal interface for an EIP-3009 compliant token.
+ * https://eips.ethereum.org/EIPS/eip-3009
+ */
+interface IERC20Auth {
+    /**
+     * @notice Receive a transfer with a signed authorization from the payer
+     * @dev This has an additional check to ensure that the payee's address matches
+     * the caller of this function to prevent front-running attacks. (See security
+     * considerations)
+     * @param from          Payer's address (Authorizer)
+     * @param to            Payee's address
+     * @param value         Amount to be transferred
+     * @param validAfter    The time after which this is valid (unix time)
+     * @param validBefore   The time before which this is valid (unix time)
+     * @param nonce         Unique nonce
+     * @param v             v of the signature
+     * @param r             r of the signature
+     * @param s             s of the signature
+     */
+    function receiveWithAuthorization(
+        address from,
+        address to,
+        uint256 value,
+        uint256 validAfter,
+        uint256 validBefore,
+        bytes32 nonce,
+        uint8 v,
+        bytes32 r,
+        bytes32 s
+    ) external;
+}

contracts/external/interfaces/IPermit2.sol

@@ -2,6 +2,19 @@
 pragma solidity ^0.8.0;
 
 interface IPermit2 {
+    struct PermitDetails {
+        address token;
+        uint160 amount;
+        uint48 expiration;
+        uint48 nonce;
+    }
+
+    struct PermitSingle {
+        PermitDetails details;
+        address spender;
+        uint256 sigDeadline;
+    }
+
     struct TokenPermissions {
         address token;
         uint256 amount;
@@ -18,6 +31,12 @@ interface IPermit2 {
         uint256 requestedAmount;
     }
 
+    function permit(
+        address owner,
+        PermitSingle memory permitSingle,
+        bytes calldata signature
+    ) external;
+
     function permitWitnessTransferFrom(
         PermitTransferFrom memory permit,
         SignatureTransferDetails calldata transferDetails,