ImageService.save(): protect against anonymouses.

No functional changes.

Author: php-coder

src/main/java/ru/mystamps/web/service/ImageServiceImpl.java

@@ -50,6 +50,7 @@ public class ImageServiceImpl implements ImageService {
 
 	@Override
 	@Transactional
+	@PreAuthorize("isAuthenticated()")
 	public Integer save(MultipartFile file) {
 		Validate.isTrue(file != null, "File must be non null");
 		Validate.isTrue(file.getSize() > 0, "Image size must be greater than zero");