회원가입 폼 리팩토링 및 유효성 검사 추가

- 회원가입 폼에서 서비스 코드 분리
- tanstack query(react-query)를 사용하여 회원가입 로직 통합
- 코드 전반에 걸쳐 가독성 및 유지 보수성 향상

src/api/authAPI.ts

@@ -0,0 +1,10 @@
+import api from "@/lib/api";
+
+export const signup = async (data: { email: string; nickname: string; password: string }) => {
+  const response = await api.post("/user", {
+    email: data.email,
+    name: data.nickname,
+    password: data.password,
+  });
+  return response.data;
+};

src/app/(auth)/components/SignupForm.tsx

@@ -1,13 +1,13 @@
 "use client";
 
-import { toast } from "react-toastify";
 import { useEffect } from "react";
-import { useRouter } from "next/navigation";
 import axios from "axios";
 import { z } from "zod";
 import { useForm } from "react-hook-form";
 import { zodResolver } from "@hookform/resolvers/zod";
 
+import { useSignup } from "@/hook/useSignup";
+
 import SubmitButton from "./SubmitButton";
 import InputField from "./InputField";
 
@@ -16,67 +16,54 @@ type FormFields = "nickname" | "email" | "password" | "passwordConfirm";
 type FormData = z.infer<typeof signupSchema>;
 
 export default function SignupForm() {
-  const router = useRouter();
-
   const {
     register,
     handleSubmit,
     formState: { errors, isSubmitting },
     trigger,
     setError,
-    clearErrors,
-    reset,
     watch,
   } = useForm<FormData>({
     resolver: zodResolver(signupSchema),
     mode: "onChange", // 실시간 유효성 검사를 위해 추가
   });
 
-  useEffect(() => {
-    const firstInput = document.getElementById("nickname") as HTMLInputElement;
-    if (firstInput) {
-      firstInput.focus();
-    }
-  }, []);
+  const signupMutation = useSignup();
 
   const onSubmit = async (data: FormData) => {
-    try {
-      const response = await axios.post(`${process.env.NEXT_PUBLIC_API_URL}/user`, {
-        email: data.email,
-        name: data.nickname,
-        password: data.password,
-      });
-
-      if (response.data) {
-        clearErrors();
-        reset();
-        toast.success("회원가입이 완료되었습니다.");
-        router.push("/login");
-      }
-    } catch (error) {
-      console.error("회원가입 서버 오류🚨", error);
+    signupMutation.mutate(data, {
+      onError: (error) => {
+        console.error("회원가입 서버 오류🚨", error);
 
-      if (axios.isAxiosError(error) && error.response) {
-        const errorCode = error.response.status;
-        const errorInfo = errorMessage[errorCode];
+        if (axios.isAxiosError(error) && error.response) {
+          const errorCode = error.response.status;
+          const errorInfo = errorMessage[errorCode];
 
-        if (errorCode) {
-          setError(errorInfo.field, {
-            type: "manual",
-            message: errorInfo.message,
-          });
+          if (errorInfo) {
+            setError(errorInfo.field, {
+              type: "manual",
+              message: errorInfo.message,
+            });
+          }
         }
-      }
-    }
+      },
+    });
   };
 
+  useEffect(() => {
+    const firstInput = document.getElementById("nickname") as HTMLInputElement;
+    if (firstInput) {
+      firstInput.focus();
+    }
+  }, []);
+
   return (
     <form className="flex flex-col justify-center" aria-label="회원가입 양식" onSubmit={handleSubmit(onSubmit)}>
       <InputField
         id="nickname"
         label="닉네임"
         type="text"
-        placeholder="닉네임을 입력해 주세요."
+        placeholder="별명(2~20자)"
         register={register}
         errors={errors}
         trigger={trigger}
@@ -86,7 +73,7 @@ export default function SignupForm() {
         id="email"
         label="아이디"
         type="email"
-        placeholder="이메일을 입력해 주세요."
+        placeholder="이메일"
         register={register}
         errors={errors}
         trigger={trigger}
@@ -96,7 +83,7 @@ export default function SignupForm() {
         id="password"
         label="비밀번호"
         type="password"
-        placeholder="비밀번호를 입력해 주세요."
+        placeholder="비밀번호"
         register={register}
         errors={errors}
         trigger={trigger}
@@ -106,7 +93,7 @@ export default function SignupForm() {
         id="passwordConfirm"
         label="비밀번호 확인"
         type="password"
-        placeholder="비밀번호를 입력해 주세요."
+        placeholder="비밀번호 확인"
         register={register}
         errors={errors}
         trigger={trigger}

src/app/(auth)/components/SignupFormContainer.tsx

@@ -8,9 +8,9 @@ export default function SignupFormContainer() {
     <section aria-labelledby="signup-heading" className="flex items-center justify-center">
       <Image alt="브랜드" width={106} height={35} src="/brand.webp" className="absolute left-4 top-4" priority />
       <div className="w-[343px] rounded-2xl bg-white px-8 py-6 sm:w-[510px] sm:rounded-3xl sm:px-14 sm:py-8 md:mx-[102px]">
-        <h2 id="signup-heading" className="pb-8 text-center text-[20px] font-bold text-black">
+        <h1 id="signup-heading" className="pb-8 text-center text-xl font-bold text-black">
           회원가입
-        </h2>
+        </h1>
         <SignupForm />
         <LoginPrompt />
       </div>

src/hook/useSignup.tsx

@@ -0,0 +1,22 @@
+import { useRouter } from "next/navigation";
+import { toast } from "react-toastify";
+import { useMutation } from "@tanstack/react-query";
+
+import { signup } from "@/api/authAPI";
+import { ErrorType } from "@/api/goalAPI";
+
+export const useSignup = () => {
+  const router = useRouter();
+  console.log("1");
+
+  return useMutation({
+    mutationFn: signup,
+    onSuccess: () => {
+      toast.success("회원가입이 완료되었습니다.");
+      router.push("/login");
+    },
+    onError: (error: ErrorType) => {
+      throw error;
+    },
+  });
+};