[BACKEND] 유저 회원 탈퇴 및 회원 전체 삭제 기능 추가 (#51)

## 📝작업 내용

>회원 탈퇴 DELETE /users
회원 전체 삭제 DELETE /users/all, 인증 불필요 (추후에 관리자만 가능하도록 변경 예정)

Author: ddoed

backend/src/main/java/com/cmg/comtogether/common/config/SwaggerConfig.java

@@ -36,7 +36,7 @@ public OpenAPI openAPI() {
     @Bean
     public OpenApiCustomizer oauthSecurityIgnoreCustomizer() {
         return openApi -> openApi.getPaths().forEach((path, pathItem) -> {
-            if (path.startsWith("/oauth") || path.startsWith("/refresh")) {
+            if (path.startsWith("/oauth") || path.startsWith("/refresh") || path.startsWith("/users/all")) {
                 pathItem.readOperations().forEach(operation -> operation.setSecurity(Collections.emptyList()));
             }
         });

backend/src/main/java/com/cmg/comtogether/common/security/config/SecurityConfig.java

@@ -13,6 +13,7 @@
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
 import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
 import org.springframework.web.cors.CorsConfigurationSource;
 
 @Configuration
@@ -38,15 +39,16 @@ public SecurityFilterChain securityFilterChain(HttpSecurity http, CorsConfigurat
                                 "/refresh/**",
                                 "/swagger-ui/**",
                                 "/v3/api-docs/**",
-                                "/products/**"
+                                "/products/**",
+                                "/users/all"
                         ).permitAll()
                         .anyRequest().authenticated()
                 )
                 .exceptionHandling(ex -> ex
                         .authenticationEntryPoint(authenticationEntryPoint)
                         .accessDeniedHandler(accessDeniedHandler)
                 )
-                .addFilterBefore(jwtAuthenticationFilter, org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter.class);;
+                .addFilterBefore(jwtAuthenticationFilter, UsernamePasswordAuthenticationFilter.class);;
 
         return http.build();
     }

backend/src/main/java/com/cmg/comtogether/user/controller/UserController.java

@@ -43,4 +43,16 @@ public ResponseEntity<ApiResponse<UserResponseDto>> initializeUser(
         UserResponseDto userResponseDto = userService.initializeUser(userDetails.getUser().getUserId(), request);
         return ResponseEntity.ok(ApiResponse.success(userResponseDto));
     }
+
+    @DeleteMapping
+    public ResponseEntity<ApiResponse<Void>> deleteUser(@AuthenticationPrincipal CustomUserDetails userDetails) {
+        userService.deleteUser(userDetails.getUser());
+        return ResponseEntity.ok(ApiResponse.success(null));
+    }
+
+    @DeleteMapping("/all")
+    public ResponseEntity<ApiResponse<Void>> deleteAllUser() {
+        userService.deleteAllUsers();
+        return ResponseEntity.ok(ApiResponse.success(null));
+    }
 }

backend/src/main/java/com/cmg/comtogether/user/service/UserService.java

@@ -17,6 +17,7 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Optional;
 
 @Service
 @RequiredArgsConstructor
@@ -64,4 +65,16 @@ public UserResponseDto initializeUser(Long userId, UserInitializeRequestDto requ
 
         return userMapper.toResponse(user);
     }
+
+    public void deleteUser(User user) {
+        Optional<User> deleteUser = userRepository.findById(user.getUserId());
+        if (deleteUser.isEmpty()) {
+            throw new BusinessException(ErrorCode.USER_NOT_FOUND);
+        }
+        userRepository.delete(deleteUser.get());
+    }
+
+    public void deleteAllUsers() {
+        userRepository.deleteAll();
+    }
 }