text: import logging
  
  from django.contrib import messages
  from django.contrib.auth.decorators import login_required
  from django.http import HttpResponseRedirect, HttpResponse
  from django.shortcuts import render
  from django.urls import reverse
  
  from bookmarks.queries import query_bookmarks
  from bookmarks.services.exporter import export_netscape_html
  from bookmarks.services.importer import import_netscape_html
  
  logger = logging.getLogger(__name__)
  
  
  @login_required
  def index(request):
      import_success_message = _find_message_with_tag(messages.get_messages(request), 'bookmark_import_success')
      import_errors_message = _find_message_with_tag(messages.get_messages(request), 'bookmark_import_errors')
      return render(request, 'settings/index.html', {
          'import_success_message': import_success_message,
          'import_errors_message': import_errors_message,
      })
  
  
  @login_required
  def bookmark_import(request):
      import_file = request.FILES.get('import_file')
  
      if import_file is None:
          messages.error(request, 'Please select a file to import.', 'bookmark_import_errors')
          return HttpResponseRedirect(reverse('bookmarks:settings.index'))
  
      try:
          content = import_file.read()
          result = import_netscape_html(content, request.user)
          success_msg = str(result.success) + ' bookmarks were successfully imported.'
          messages.success(request, success_msg, 'bookmark_import_success')
          if result.failed > 0:
              err_msg = str(result.failed) + ' bookmarks could not be imported. Please check the logs for more details.'
              messages.error(request, err_msg, 'bookmark_import_errors')
      except:
          logging.exception('Unexpected error during bookmark import')
          messages.error(request, 'An error occurred during bookmark import.', 'bookmark_import_errors')
          pass
  
      return HttpResponseRedirect(reverse('bookmarks:settings.index'))
  
  
  @login_required
  def bookmark_export(request):
      # noinspection PyBroadException
      try:
          bookmarks = query_bookmarks(request.user, '')
          file_content = export_netscape_html(bookmarks)
  
          response = HttpResponse(content_type='text/plain; charset=UTF-8')
          response['Content-Disposition'] = 'attachment; filename="bookmarks.html"'
          response.write(file_content)
  
          return response
      except:
          return render(request, 'settings/index.html', {
              'export_error': 'An error occurred during bookmark export.'
          })
  
  
  def _find_message_with_tag(messages, tag):
      for message in messages:
          if message.extra_tags == tag:
              return message
  