feat(markers): get by id

src/main/java/com/ddf/vodsystem/controllers/GlobalExceptionHandler.java

@@ -115,4 +115,11 @@ public class GlobalExceptionHandler {
         APIResponse<Void> response = new APIResponse<>(ERROR, ex.getMessage(), null);
         return ResponseEntity.status(HttpStatus.CONFLICT).body(response);
     }
+
+    @ExceptionHandler(MarkerNotFound.class)
+    public ResponseEntity<APIResponse<Void>> handleMarkerNotFound(MarkerNotFound ex) {
+        logger.error("MarkerNotFound: {}", ex.getMessage());
+        APIResponse<Void> response = new APIResponse<>(ERROR, ex.getMessage(), null);
+        return ResponseEntity.status(HttpStatus.NOT_FOUND).body(response);
+    }
 }

src/main/java/com/ddf/vodsystem/controllers/MarkerController.java

@@ -33,6 +33,15 @@ public class MarkerController {
         );
     }
 
+    @GetMapping("/{id}")
+    public ResponseEntity<APIResponse<MarkerResponse>> getMarkerById(@PathVariable Long id) {
+        Marker marker = markerService.getMarkerById(id);
+
+        return ResponseEntity.ok(
+                new APIResponse<>(SUCCESS, "Marker retrieved successfully", convertToDTO(marker))
+        );
+    }
+
     @PostMapping("")
     public ResponseEntity<APIResponse<MarkerResponse>> createMarker(@Valid @RequestBody MarkerCreateRequest request) {
         Marker marker = markerService.create(request.message());

src/main/java/com/ddf/vodsystem/exceptions/MarkerNotFound.java

@@ -0,0 +1,7 @@
+package com.ddf.vodsystem.exceptions;
+
+public class MarkerNotFound extends RuntimeException {
+    public MarkerNotFound(String message) {
+        super(message);
+    }
+}

src/main/java/com/ddf/vodsystem/services/MarkerService.java

@@ -3,6 +3,7 @@ package com.ddf.vodsystem.services;
 import com.ddf.vodsystem.entities.Marker;
 import com.ddf.vodsystem.entities.Stream;
 import com.ddf.vodsystem.entities.User;
+import com.ddf.vodsystem.exceptions.MarkerNotFound;
 import com.ddf.vodsystem.exceptions.NotAuthenticated;
 import com.ddf.vodsystem.exceptions.NotStreaming;
 import com.ddf.vodsystem.repositories.MarkerRepository;
@@ -25,6 +26,21 @@ public class MarkerService {
         this.markerRepository = markerRepository;
     }
 
+    public Marker getMarkerById(Long id) {
+        Optional<Marker> marker = markerRepository.findById(id);
+
+        if (marker.isEmpty()) {
+            throw new MarkerNotFound("Marker does not exist");
+        }
+
+        Optional<User> user = userService.getLoggedInUser();
+        if (user.isEmpty() || !user.get().equals(marker.get().getUser())) {
+            throw new NotAuthenticated("User not authenticated for this marker");
+        }
+
+        return marker.get();
+    }
+
     public List<Marker> getUserMarkers() {
         Optional<User> user = userService.getLoggedInUser();