feat: 로그인 로그아웃 유틸리티 함수 구현

Author: Woolegend

pages/signin.tsx

@@ -1,6 +1,7 @@
 import { postSignIn, SignInParams } from "@/api/auth.api";
 import { setInstanceHeaders } from "@/api/axios";
 import useAsync from "@/hooks/useAsync";
+import setLogIn from "@/lib/setLogIn";
 import styles from "@/styles/login.module.css";
 import Image from "next/image";
 import Link from "next/link";
@@ -51,11 +52,7 @@ export default function SignIn() {
 
     const response = await postSignInAsync(values);
     if (response) {
-      sessionStorage.setItem("user", JSON.stringify(response.user));
-      sessionStorage.setItem("accessToken", response.accessToken);
-      sessionStorage.setItem("refreshToken", response.refreshToken);
-      setInstanceHeaders(response.accessToken);
-
+      setLogIn(response);
       router.push("/");
     } else alert("회원가입에 실패했습니다.");
   };

pages/signup.tsx

@@ -1,6 +1,7 @@
 import { postSignUp, SignUpParams } from "@/api/auth.api";
 import { setInstanceHeaders } from "@/api/axios";
 import useAsync from "@/hooks/useAsync";
+import setLogIn from "@/lib/setLogIn";
 import styles from "@/styles/login.module.css";
 import Image from "next/image";
 import Link from "next/link";
@@ -68,10 +69,7 @@ export default function SignUp() {
     }
     const response = await postSignUpAsync(values);
     if (response) {
-      sessionStorage.setItem("user", JSON.stringify(response.user));
-      sessionStorage.setItem("accessToken", response.accessToken);
-      sessionStorage.setItem("refreshToken", response.refreshToken);
-      setInstanceHeaders(response.accessToken);
+      setLogIn(response);
       router.push("/");
     } else alert("회원가입에 실패했습니다.");
   };