[Hotfix/#55] 현재 유저 상태 조회 API 추가

src/main/java/com/goormthon/backend/firstsori/domain/user/application/dto/response/LoginCheckResponse.java

@@ -0,0 +1,29 @@
+package com.goormthon.backend.firstsori.domain.user.application.dto.response;
+
+import com.goormthon.backend.firstsori.domain.user.domain.entity.User;
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+@Builder
+public class LoginCheckResponse {
+    private boolean validUser;
+    private boolean isOwner;
+    private boolean invalidToken;
+
+    public static LoginCheckResponse invalidToken() {
+        return LoginCheckResponse.builder()
+                .validUser(false)
+                .isOwner(false)
+                .invalidToken(true)
+                .build();
+    }
+
+    public static LoginCheckResponse of(User user, boolean isOwner) {
+        return LoginCheckResponse.builder()
+                .validUser(true)
+                .isOwner(isOwner)
+                .invalidToken(false)
+                .build();
+    }
+}

src/main/java/com/goormthon/backend/firstsori/domain/user/domain/service/LoginCheckService.java

@@ -0,0 +1,29 @@
+package com.goormthon.backend.firstsori.domain.user.domain.service;
+
+import com.goormthon.backend.firstsori.domain.board.domain.repository.BoardRepository;
+import com.goormthon.backend.firstsori.domain.user.application.dto.response.LoginCheckResponse;
+import com.goormthon.backend.firstsori.domain.user.domain.entity.User;
+import com.goormthon.backend.firstsori.global.auth.oauth2.domain.PrincipalDetails;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class LoginCheckService {
+
+    private final BoardRepository boardRepository;
+
+    public LoginCheckResponse checkLogin(PrincipalDetails principal, String shareUri) {
+        if (principal == null || principal.getUser() == null) {
+            return LoginCheckResponse.invalidToken();
+        }
+
+        User user = principal.getUser();
+
+        boolean isOwner = boardRepository.findByShareUri(shareUri)
+                .map(board -> board.getUser().equals(user))
+                .orElse(false);
+
+        return LoginCheckResponse.of(user, isOwner);
+    }
+}

src/main/java/com/goormthon/backend/firstsori/domain/user/presentation/AuthController.java

@@ -2,10 +2,12 @@
 
 import com.goormthon.backend.firstsori.domain.board.application.dto.request.CreateBoardRequest;
 import com.goormthon.backend.firstsori.domain.board.application.usecase.BoardUseCase;
+import com.goormthon.backend.firstsori.domain.user.application.dto.response.LoginCheckResponse;
 import com.goormthon.backend.firstsori.domain.user.application.usecase.UserUseCase;
 import com.goormthon.backend.firstsori.domain.user.domain.entity.User;
 import com.goormthon.backend.firstsori.domain.user.domain.entity.enums.Provider;
 import com.goormthon.backend.firstsori.domain.user.domain.entity.enums.Status;
+import com.goormthon.backend.firstsori.domain.user.domain.service.LoginCheckService;
 import com.goormthon.backend.firstsori.domain.user.presentation.spec.AuthControllerSpec;
 import com.goormthon.backend.firstsori.global.auth.jwt.service.JwtTokenUseCase;
 import com.goormthon.backend.firstsori.global.auth.oauth2.domain.PrincipalDetails;
@@ -20,9 +22,9 @@
 import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
-
 import java.util.UUID;
 
 import static com.goormthon.backend.firstsori.domain.user.domain.entity.enums.Role.ADMIN;
@@ -33,6 +35,7 @@
 @RequiredArgsConstructor
 public class AuthController implements AuthControllerSpec {
 
+    private final LoginCheckService loginCheckService;
     private final JwtTokenUseCase tokenService;
     private final UserUseCase userService;
     private final BoardUseCase boardService;
@@ -99,4 +102,15 @@ private User createDev() {
 
     }
 
+    // 유저 확인 (유효유저/조회 보드와 유저의 관계 확인)
+    @PostMapping("/check-login")
+    public ApiResponse<LoginCheckResponse> checkLogin(
+            @AuthenticationPrincipal PrincipalDetails user,
+            @RequestParam String shareUri) {
+
+        LoginCheckResponse response = loginCheckService.checkLogin(user, shareUri);
+        return ApiResponse.ok(response);
+    }
+
+
 }

src/main/java/com/goormthon/backend/firstsori/domain/user/presentation/spec/AuthControllerSpec.java

@@ -1,8 +1,10 @@
 package com.goormthon.backend.firstsori.domain.user.presentation.spec;
 
+import com.goormthon.backend.firstsori.domain.user.application.dto.response.LoginCheckResponse;
 import com.goormthon.backend.firstsori.global.auth.oauth2.domain.PrincipalDetails;
 import com.goormthon.backend.firstsori.global.common.response.ApiResponse;
 import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.tags.Tag;
 import io.swagger.v3.oas.annotations.responses.ApiResponses;
 import jakarta.servlet.http.HttpServletRequest;
@@ -50,4 +52,23 @@ ApiResponse<String> logout(
             HttpServletRequest request,
             HttpServletResponse response);
 
+    @Operation(
+            summary = "로그인 상태 확인 API",
+            description = "쿠키(토큰)와 공유 링크 값을 전달하면, 유저의 로그인 상태와 보드 소유 여부를 반환합니다."
+    )
+    @ApiResponses(value = {
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                    responseCode = "200",
+                    description = "정상 응답",
+                    content = @io.swagger.v3.oas.annotations.media.Content(
+                            mediaType = "application/json",
+                            schema = @io.swagger.v3.oas.annotations.media.Schema(ref = "#/components/schemas/ApiResponseLoginCheck")
+                    )
+            )
+    })
+    ApiResponse<LoginCheckResponse> checkLogin(
+            @AuthenticationPrincipal PrincipalDetails principal,
+            @Parameter(name = "shareUri", description = "접속하려는 보드의 공유 링크 값") String shareUri
+    );
+
 }

src/main/java/com/goormthon/backend/firstsori/global/auth/jwt/filter/RequestMatcherHolder.java

@@ -30,6 +30,7 @@ public class RequestMatcherHolder {
             new RequestInfo(GET, "/api/v1/oauth2/**", null),
             new RequestInfo(GET, "/oauth2/authorization/**", null),   // Spring Security 기본 엔드포인트
             new RequestInfo(GET, "/login/oauth2/code/**", null),       // callback URL
+            new RequestInfo(POST,"/api/v1/auth/check-login", null),
 
             // 유저 관련
             new RequestInfo(POST, "/api/v1/auth/reissue", null),