feat: Add auth controller (#1)

src/main/java/com/beotkkot/qtudy/controller/auth/AuthController.java

@@ -0,0 +1,72 @@
+package com.beotkkot.qtudy.controller.auth;
+
+import com.beotkkot.qtudy.domain.user.Users;
+import com.beotkkot.qtudy.dto.KakaoUserInfo;
+import com.beotkkot.qtudy.dto.UserResponse;
+import com.beotkkot.qtudy.service.auth.AuthService;
+import jakarta.servlet.http.HttpSession;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@RestController
+@RequestMapping("/auth/kakao")
+@RequiredArgsConstructor
+public class AuthController {
+
+    private final AuthService authService;
+
+    // 프론트로부터 인가 code를 받아와 카카오 서버로부터 토큰 얻기
+    @GetMapping("")
+    public ResponseEntity<Object> kakaoLogin(@RequestParam("code") String code, HttpSession session) {
+
+        System.out.println("code = " + code);
+
+        // 1. 인가 코드를 통해 카카오 서버로부터 토큰을 얻는다
+        String accessToken = authService.getAccessToken(code);
+
+        // 2. 발급받은 토큰을 이용해 사용자 정보를 조회
+        KakaoUserInfo kakaoUserInfo = authService.getKakaoUserInfo(accessToken);
+
+        // 3. 로그인
+        Users user = authService.login(kakaoUserInfo);
+
+        if (user.getKakaoId() != null) {
+            session.setAttribute("kakaoId", user.getKakaoId());
+            session.setAttribute("accessToken", accessToken);
+        }
+
+        // 4. 유저 정보 리턴
+        UserResponse userResponse = new UserResponse(
+                "SU",
+                "Sucess",
+                user.getUserId(),
+                user.getKakaoId(),
+                user.getName(),
+                user.getProfileImageUrl(),
+                accessToken
+        );
+        return ResponseEntity.status(HttpStatus.OK).body(userResponse);
+    }
+
+    @PostMapping("/logout")
+    public ResponseEntity<Map<String,String>> logout(HttpSession session) {
+
+        String accessToken = (String)session.getAttribute("accessToken");
+        if (accessToken != null && !"".equals(accessToken)) {
+            authService.logout(accessToken);
+            session.removeAttribute("kakaoId");
+            session.removeAttribute("accessToken");
+        }
+
+        // 로그아웃 성공 메시지 반환
+        Map<String, String> response = new HashMap<>();
+        response.put("code", "SU");
+        response.put("message", "Success");
+        return ResponseEntity.ok(response);
+    }
+}