v0.1.60 - 닉네임 중복 검증과 비밀번호 재설정 연결

backend/src/routes/auth.js

@@ -108,6 +108,16 @@ function sanitizeUser(user) {
   }
 }
 
+async function findUserByNickname(nickname) {
+  const [user] = await db
+    .select()
+    .from(users)
+    .where(eq(users.nickname, nickname))
+    .limit(1)
+
+  return user ?? null
+}
+
 export async function registerAuthRoutes(app) {
   app.post('/api/auth/signup', async (request, reply) => {
     const payload = signupSchema.safeParse(request.body)
@@ -134,6 +144,14 @@ export async function registerAuthRoutes(app) {
       })
     }
 
+    const existingNicknameUser = await findUserByNickname(nickname)
+
+    if (existingNicknameUser) {
+      return reply.code(409).send({
+        message: '이미 사용 중인 닉네임입니다.',
+      })
+    }
+
     const now = new Date()
     const passwordHash = await hashPassword(password)
     const [user] = await db
@@ -266,6 +284,14 @@ export async function registerAuthRoutes(app) {
       })
     }
 
+    const existingNicknameUser = await findUserByNickname(payload.data.nickname)
+
+    if (existingNicknameUser && existingNicknameUser.id !== user.id) {
+      return reply.code(409).send({
+        message: '이미 사용 중인 닉네임입니다.',
+      })
+    }
+
     const [updatedUser] = await db
       .update(users)
       .set({