ADD functionality to retrieve and display clips by ID

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

@@ -7,6 +7,8 @@ import org.springframework.http.HttpHeaders;
 import org.springframework.http.MediaType;
 import org.springframework.http.MediaTypeFactory;
 import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.security.oauth2.core.user.OAuth2User;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
@@ -51,7 +53,7 @@ public class DownloadController {
     }
 
     @GetMapping("/clip/{id}")
-    public ResponseEntity<Resource> downloadClip(@PathVariable Long id) {
+    public ResponseEntity<Resource> downloadClip(@AuthenticationPrincipal OAuth2User principal, @PathVariable Long id) {
         Resource resource = downloadService.downloadClip(id);
 
         if (resource == null || !resource.exists()) {