Merge pull request #151 from 1inch/feature/patch-permit2-interface

[SC-1236] Patch permit2 interface

contracts/interfaces/IPermit2.sol

@@ -70,4 +70,15 @@ interface IPermit2 {
      * @return The packed allowance details.
      */
     function allowance(address user, address token, address spender) external view returns (PackedAllowance memory);
+
+    /**
+     * @notice Approves the spender to use up to amount of the specified token up until the expiration
+     * @param token The token to approve
+     * @param spender The spender address to approve
+     * @param amount The approved amount of the token
+     * @param expiration The timestamp at which the approval is no longer valid
+     * @dev The packed allowance also holds a nonce, which will stay unchanged in approve
+     * @dev Setting amount to type(uint160).max sets an unlimited approval
+     */
+    function approve(address token, address spender, uint160 amount, uint48 expiration) external;
 }

docs/contracts/interfaces/IPermit2.md

@@ -12,6 +12,7 @@ _Interface for a flexible permit system that extends ERC20 tokens to support per
 - [transferFrom(user, spender, amount, token) external](#transferfrom)
 - [permit(owner, permitSingle, signature) external](#permit)
 - [allowance(user, token, spender) external](#allowance)
+- [approve(token, spender, amount, expiration) external](#approve)
 
 ### Types
 ### PermitDetails
@@ -102,3 +103,22 @@ Retrieves the allowance details between a token owner and spender.
 | ---- | ---- | ----------- |
 [0] | struct IPermit2.PackedAllowance | The packed allowance details. |
 
+### approve
+
+```solidity
+function approve(address token, address spender, uint160 amount, uint48 expiration) external
+```
+Approves the spender to use up to amount of the specified token up until the expiration
+
+_The packed allowance also holds a nonce, which will stay unchanged in approve
+Setting amount to type(uint160).max sets an unlimited approval_
+
+#### Parameters
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| token | address | The token to approve |
+| spender | address | The spender address to approve |
+| amount | uint160 | The approved amount of the token |
+| expiration | uint48 | The timestamp at which the approval is no longer valid |
+

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@1inch/solidity-utils",
-  "version": "5.2.1",
+  "version": "5.2.2",
   "main": "dist/src/index.js",
   "types": "dist/src/index.d.ts",
   "exports": {