Added extension header

src/Application/Interfaces/Services/IBookService.cs

@@ -16,4 +16,5 @@ public interface IBookService
  Task<Stream> GetBookCover(string email, Guid guid);
  Task DeleteBookCover(string email, Guid guid);
  Task<string> GetFormatForBook(string email, Guid guid);
+ Task<string> GetExtensionForBook(string email, Guid guid);
 }

src/Application/Services/BookService.cs

@@ -255,6 +255,19 @@ public async Task<string> GetFormatForBook(string email, Guid guid)
  return book.Format;
  }
 
+ public async Task<string> GetExtensionForBook(string email, Guid guid)
+ {
+ var user = await _userRepository.GetAsync(email, trackChanges: true);
+ var book = user.Books.SingleOrDefault(book => book.BookId == guid);
+ if (book == null)
+ {
+ const string message = "No book with this id exists";
+ throw new CommonErrorException(404, message, 4);
+ }
+
+ return book.Extension;
+ }
+
  public async Task ChangeBookCover(string email, Guid guid, MultipartReader reader)
  {
  var user = await _userRepository.GetAsync(email, trackChanges: true);

src/Presentation/Controllers/BookController.cs

@@ -71,9 +71,14 @@ public async Task<ActionResult> GetBookBinaryData(Guid guid)
  var email = HttpContext.User.Identity!.Name;
  var stream = await _bookService.GetBookBinaryData(email, 
  guid);
-
+ // This is added for legacy purposes. Previously the client depended on getting the format, but newer
+ // clients use the extension. We keep it to keep the old clients working.
  Response.Headers.Add("Format",
  await _bookService.GetFormatForBook(email, guid));
+
+ Response.Headers.Add("Extension",
+ await _bookService.GetExtensionForBook(email, guid));
+
  return File(stream, "application/octet-stream");
  }
  catch (CommonErrorException e)