[Feat]#18 트래킹 세션

src/main/java/com/semosan/api/ApiApplication.java

@@ -5,8 +5,10 @@
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
+import org.springframework.scheduling.annotation.EnableScheduling;
 
 @EnableJpaAuditing
+@EnableScheduling
 @SpringBootApplication
 @EnableConfigurationProperties(KakaoProperties.class)
 public class ApiApplication {

src/main/java/com/semosan/api/common/status/ErrorStatus.java

@@ -101,6 +101,16 @@ public enum ErrorStatus implements BaseStatus {
     HIKING_RECORD_NOT_FOUND(HttpStatus.NOT_FOUND, "HIKE_404_1", "등산 기록을 찾을 수 없습니다."),
     HIKING_RECORD_FORBIDDEN(HttpStatus.FORBIDDEN, "HIKE_403_1", "본인이 참여한 등산 기록만 공유할 수 있습니다."),
 
+    /**
+     * Tracking (트래킹 세션)
+     */
+    TRACKING_SESSION_NOT_FOUND(HttpStatus.NOT_FOUND, "TRK_404_1", "트래킹 세션을 찾을 수 없습니다."),
+    TRACKING_SESSION_FORBIDDEN(HttpStatus.FORBIDDEN, "TRK_403_1", "본인의 트래킹 세션만 조작할 수 있습니다."),
+    TRACKING_SESSION_ALREADY_IN_PROGRESS(HttpStatus.CONFLICT, "TRK_409_1", "이미 진행 중인 트래킹 세션이 있습니다."),
+    TRACKING_SESSION_INVALID_STATE(HttpStatus.CONFLICT, "TRK_409_2", "현재 상태에서는 수행할 수 없는 작업입니다."),
+    TRACKING_COURSE_MOUNTAIN_MISMATCH(HttpStatus.BAD_REQUEST, "TRK_400_1", "선택한 코스가 해당 산의 코스가 아닙니다."),
+    COURSE_NOT_FOUND(HttpStatus.NOT_FOUND, "MTN_404_3", "코스를 찾을 수 없습니다."),
+
     /**
      * Post (게시글 공통)
      */

src/main/java/com/semosan/api/common/status/SuccessStatus.java

@@ -49,9 +49,16 @@ public enum SuccessStatus implements BaseStatus {
     GET_HIKING_RECORD_LIST_SUCCESS(HttpStatus.OK, "HIKING_200_3", "나의 등산 기록 목록 조회에 성공했습니다."),
 
     /**
-     * Tracking
+     * Tracking — 진입 화면 (#45) & 세션 (#18)
      */
     TRACKING_NEAREST_MOUNTAIN_SUCCESS(HttpStatus.OK, "TRK_200_1", "현재 위치 기준 가까운 산과 코스 조회에 성공했습니다."),
+    TRACKING_SESSION_CREATE_SUCCESS(HttpStatus.CREATED, "TRK_201_1", "트래킹 세션이 시작되었습니다."),
+    TRACKING_SESSION_GET_ACTIVE_SUCCESS(HttpStatus.OK, "TRK_200_2", "현재 진행 중인 트래킹 세션 조회에 성공했습니다."),
+    TRACKING_SESSION_GET_SUCCESS(HttpStatus.OK, "TRK_200_3", "트래킹 세션 상세 조회에 성공했습니다."),
+    TRACKING_SESSION_PAUSE_SUCCESS(HttpStatus.OK, "TRK_200_4", "트래킹 세션을 일시정지했습니다."),
+    TRACKING_SESSION_RESUME_SUCCESS(HttpStatus.OK, "TRK_200_5", "트래킹 세션을 재개했습니다."),
+    TRACKING_SESSION_COMPLETE_SUCCESS(HttpStatus.OK, "TRK_200_6", "트래킹 세션을 종료했습니다."),
+    TRACKING_SESSION_ABANDON_SUCCESS(HttpStatus.OK, "TRK_200_7", "트래킹 세션을 포기 처리했습니다."),
 
     /**
      * Image

src/main/java/com/semosan/api/domain/tracking/controller/TrackingController.java

@@ -5,9 +5,12 @@
 import com.semosan.api.domain.tracking.controller.docs.TrackingControllerDocs;
 import com.semosan.api.domain.tracking.dto.response.NearbyMountainResponse;
 import com.semosan.api.domain.tracking.service.TrackingService;
+import jakarta.validation.constraints.Max;
+import jakarta.validation.constraints.Min;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
@@ -16,21 +19,23 @@
 @RestController
 @RequestMapping("/api/tracking")
 @RequiredArgsConstructor
+@Validated
 public class TrackingController implements TrackingControllerDocs {
 
     private final TrackingService trackingService;
 
     /**
      * 트래킹 진입 화면에서 호출.
      * 프론트가 디바이스 GPS 좌표(lat, lng)를 보내면, 가장 가까운 산과 그 산의 코스 목록을 반환한다.
-     * 인증 필수 — 트래킹은 로그인 사용자만 시작 가능.
+     * 인증 필수 — 트래킹은 로그인 사용자만 시작 가능 (userId 는 Spring Security 인증 통과 강제용).
+     * 사용자별 개인화는 추후 도입 시 service 로 userId 를 넘겨 활용.
      */
     @GetMapping("/nearby-mountain")
     @Override
     public ResponseEntity<ApiResponse<NearbyMountainResponse>> getNearbyMountain(
             @AuthenticationPrincipal Long userId,
-            @RequestParam Double lat,
-            @RequestParam Double lng
+            @RequestParam @Min(-90) @Max(90) Double lat,
+            @RequestParam @Min(-180) @Max(180) Double lng
     ) {
         NearbyMountainResponse response = trackingService.getNearbyMountain(lat, lng);
         return ApiResponse.success(SuccessStatus.TRACKING_NEAREST_MOUNTAIN_SUCCESS, response);

src/main/java/com/semosan/api/domain/tracking/controller/TrackingSessionController.java

@@ -0,0 +1,93 @@
+package com.semosan.api.domain.tracking.controller;
+
+import com.semosan.api.common.response.ApiResponse;
+import com.semosan.api.common.status.SuccessStatus;
+import com.semosan.api.domain.tracking.controller.docs.TrackingSessionControllerDocs;
+import com.semosan.api.domain.tracking.dto.request.CreateTrackingSessionRequest;
+import com.semosan.api.domain.tracking.dto.response.TrackingSessionResponse;
+import com.semosan.api.domain.tracking.service.TrackingSessionService;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/api/tracking/sessions")
+@RequiredArgsConstructor
+public class TrackingSessionController implements TrackingSessionControllerDocs {
+
+    private final TrackingSessionService trackingSessionService;
+
+    @PostMapping
+    @Override
+    public ResponseEntity<ApiResponse<TrackingSessionResponse>> createSession(
+            @AuthenticationPrincipal Long userId,
+            @Valid @RequestBody CreateTrackingSessionRequest request
+    ) {
+        TrackingSessionResponse response = trackingSessionService.create(userId, request);
+        return ApiResponse.success(SuccessStatus.TRACKING_SESSION_CREATE_SUCCESS, response);
+    }
+
+    /**
+     * 앱 재진입 시 호출. 진행 중 세션이 없으면 data 가 비어 응답된다 (NON_NULL 직렬화).
+     */
+    @GetMapping("/me/active")
+    @Override
+    public ResponseEntity<ApiResponse<TrackingSessionResponse>> getActiveSession(
+            @AuthenticationPrincipal Long userId
+    ) {
+        TrackingSessionResponse response = trackingSessionService.getActive(userId).orElse(null);
+        return ApiResponse.success(SuccessStatus.TRACKING_SESSION_GET_ACTIVE_SUCCESS, response);
+    }
+
+    @GetMapping("/{sessionId}")
+    @Override
+    public ResponseEntity<ApiResponse<TrackingSessionResponse>> getSession(
+            @AuthenticationPrincipal Long userId,
+            @PathVariable Long sessionId
+    ) {
+        TrackingSessionResponse response = trackingSessionService.get(userId, sessionId);
+        return ApiResponse.success(SuccessStatus.TRACKING_SESSION_GET_SUCCESS, response);
+    }
+
+    @PostMapping("/{sessionId}/pause")
+    @Override
+    public ResponseEntity<ApiResponse<TrackingSessionResponse>> pauseSession(
+            @AuthenticationPrincipal Long userId,
+            @PathVariable Long sessionId
+    ) {
+        TrackingSessionResponse response = trackingSessionService.pause(userId, sessionId);
+        return ApiResponse.success(SuccessStatus.TRACKING_SESSION_PAUSE_SUCCESS, response);
+    }
+
+    @PostMapping("/{sessionId}/resume")
+    @Override
+    public ResponseEntity<ApiResponse<TrackingSessionResponse>> resumeSession(
+            @AuthenticationPrincipal Long userId,
+            @PathVariable Long sessionId
+    ) {
+        TrackingSessionResponse response = trackingSessionService.resume(userId, sessionId);
+        return ApiResponse.success(SuccessStatus.TRACKING_SESSION_RESUME_SUCCESS, response);
+    }
+
+    @PostMapping("/{sessionId}/complete")
+    @Override
+    public ResponseEntity<ApiResponse<TrackingSessionResponse>> completeSession(
+            @AuthenticationPrincipal Long userId,
+            @PathVariable Long sessionId
+    ) {
+        TrackingSessionResponse response = trackingSessionService.complete(userId, sessionId);
+        return ApiResponse.success(SuccessStatus.TRACKING_SESSION_COMPLETE_SUCCESS, response);
+    }
+
+    @PostMapping("/{sessionId}/abandon")
+    @Override
+    public ResponseEntity<ApiResponse<TrackingSessionResponse>> abandonSession(
+            @AuthenticationPrincipal Long userId,
+            @PathVariable Long sessionId
+    ) {
+        TrackingSessionResponse response = trackingSessionService.abandon(userId, sessionId);
+        return ApiResponse.success(SuccessStatus.TRACKING_SESSION_ABANDON_SUCCESS, response);
+    }
+}

src/main/java/com/semosan/api/domain/tracking/controller/docs/TrackingSessionControllerDocs.java

@@ -0,0 +1,87 @@
+package com.semosan.api.domain.tracking.controller.docs;
+
+import com.semosan.api.common.response.ApiResponse;
+import com.semosan.api.domain.tracking.dto.request.CreateTrackingSessionRequest;
+import com.semosan.api.domain.tracking.dto.response.TrackingSessionResponse;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.Parameter;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.Schema;
+import io.swagger.v3.oas.annotations.responses.ApiResponses;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestBody;
+
+@Tag(name = "Tracking Session", description = "트래킹 세션 관리 API")
+public interface TrackingSessionControllerDocs {
+
+    @Operation(
+            summary = "트래킹 세션 시작",
+            description = "산/코스 정보로 새 트래킹 세션을 생성합니다. 자유 기록(isFreeRecording=true)이면 courseId 는 무시됩니다. "
+                    + "유저당 진행 중 세션이 이미 있으면 409 응답."
+    )
+    @ApiResponses({
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "201", description = "세션 생성 성공"),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "404", description = "산 또는 코스 없음",
+                    content = @Content(schema = @Schema(implementation = ApiResponse.class))),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "409", description = "이미 진행 중인 세션 존재",
+                    content = @Content(schema = @Schema(implementation = ApiResponse.class)))
+    })
+    ResponseEntity<ApiResponse<TrackingSessionResponse>> createSession(
+            @Parameter(hidden = true) @AuthenticationPrincipal Long userId,
+            @Valid @RequestBody CreateTrackingSessionRequest request
+    );
+
+    @Operation(summary = "현재 진행 중 트래킹 세션 조회",
+            description = "앱 재진입 시 호출. 진행 중(IN_PROGRESS/PAUSED) 세션이 없으면 data 가 비어 응답됩니다.")
+    @ApiResponses({@io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "조회 성공")})
+    ResponseEntity<ApiResponse<TrackingSessionResponse>> getActiveSession(
+            @Parameter(hidden = true) @AuthenticationPrincipal Long userId
+    );
+
+    @Operation(summary = "트래킹 세션 상세 조회", description = "본인 소유 세션만 조회 가능합니다.")
+    @ApiResponses({
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "조회 성공"),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "403", description = "본인 세션 아님",
+                    content = @Content(schema = @Schema(implementation = ApiResponse.class))),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "404", description = "세션 없음",
+                    content = @Content(schema = @Schema(implementation = ApiResponse.class)))
+    })
+    ResponseEntity<ApiResponse<TrackingSessionResponse>> getSession(
+            @Parameter(hidden = true) @AuthenticationPrincipal Long userId,
+            @Parameter(description = "세션 ID", required = true) @PathVariable Long sessionId
+    );
+
+    @Operation(summary = "트래킹 세션 일시정지", description = "IN_PROGRESS 상태에서만 가능. 점 수집은 멈추고 duration 에서 제외됩니다.")
+    @ApiResponses({
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "일시정지 성공"),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "409", description = "현재 상태에서 일시정지 불가",
+                    content = @Content(schema = @Schema(implementation = ApiResponse.class)))
+    })
+    ResponseEntity<ApiResponse<TrackingSessionResponse>> pauseSession(
+            @Parameter(hidden = true) @AuthenticationPrincipal Long userId,
+            @PathVariable Long sessionId
+    );
+
+    @Operation(summary = "트래킹 세션 재개", description = "PAUSED 상태에서만 가능. 일시정지 누적 시간이 합산됩니다.")
+    ResponseEntity<ApiResponse<TrackingSessionResponse>> resumeSession(
+            @Parameter(hidden = true) @AuthenticationPrincipal Long userId,
+            @PathVariable Long sessionId
+    );
+
+    @Operation(summary = "트래킹 세션 정상 종료",
+            description = "세션 상태/시각만 마감합니다. 실제 HikingRecord 변환은 #20 에서 구현됩니다.")
+    ResponseEntity<ApiResponse<TrackingSessionResponse>> completeSession(
+            @Parameter(hidden = true) @AuthenticationPrincipal Long userId,
+            @PathVariable Long sessionId
+    );
+
+    @Operation(summary = "트래킹 세션 포기", description = "기록 없이 세션을 ABANDONED 처리합니다.")
+    ResponseEntity<ApiResponse<TrackingSessionResponse>> abandonSession(
+            @Parameter(hidden = true) @AuthenticationPrincipal Long userId,
+            @PathVariable Long sessionId
+    );
+}

src/main/java/com/semosan/api/domain/tracking/dto/request/CreateTrackingSessionRequest.java

@@ -0,0 +1,15 @@
+package com.semosan.api.domain.tracking.dto.request;
+
+import jakarta.validation.constraints.NotNull;
+
+public record CreateTrackingSessionRequest(
+        @NotNull(message = "산 ID는 필수입니다.")
+        Long mountainId,
+
+        /** 자유 기록(코스 미선택) 인 경우 null */
+        Long courseId,
+
+        @NotNull(message = "자유 기록 여부는 필수입니다.")
+        Boolean isFreeRecording
+) {
+}

src/main/java/com/semosan/api/domain/tracking/dto/response/TrackingSessionResponse.java

@@ -0,0 +1,39 @@
+package com.semosan.api.domain.tracking.dto.response;
+
+import com.semosan.api.domain.tracking.entity.TrackingSession;
+import com.semosan.api.domain.tracking.enums.TrackingSessionStatus;
+
+import java.time.LocalDateTime;
+
+public record TrackingSessionResponse(
+        Long sessionId,
+        Long userId,
+        Long mountainId,
+        String mountainName,
+        Long courseId,
+        String courseName,
+        Boolean isFreeRecording,
+        TrackingSessionStatus status,
+        LocalDateTime startedAt,
+        LocalDateTime endedAt,
+        LocalDateTime pausedAt,
+        Integer pausedSecondsTotal
+) {
+
+    public static TrackingSessionResponse from(TrackingSession session) {
+        return new TrackingSessionResponse(
+                session.getId(),
+                session.getUser().getId(),
+                session.getMountain().getId(),
+                session.getMountain().getName(),
+                session.getCourse() != null ? session.getCourse().getId() : null,
+                session.getCourse() != null ? session.getCourse().getName() : null,
+                session.getIsFreeRecording(),
+                session.getStatus(),
+                session.getStartedAt(),
+                session.getEndedAt(),
+                session.getPausedAt(),
+                session.getPausedSecondsTotal()
+        );
+    }
+}