src/catalogue/ebook_utils.py

   1 # -*- coding: utf-8 -*-
   2 from io import BytesIO
   3 from catalogue.models import Book
   4 from librarian import DocProvider
   5 from django.http import HttpResponse
   6
   7
   8 class RedakcjaDocProvider(DocProvider):
   9     """Used for getting books' children."""
  10
  11     def __init__(self, publishable):
  12         self.publishable = publishable
  13
  14     def by_slug(self, slug):
  15         return BytesIO(Book.objects.get(dc_slug=slug
  16                     ).materialize(publishable=self.publishable
  17                     ).encode('utf-8'))
  18
  19
  20 def serve_file(file_path, name, mime_type):
  21     def read_chunks(f, size=8192):
  22         chunk = f.read(size)
  23         while chunk:
  24             yield chunk
  25             chunk = f.read(size)
  26
  27     response = HttpResponse(content_type=mime_type)
  28     response['Content-Disposition'] = 'attachment; filename=%s' % name
  29     with open(file_path, 'rb') as f:
  30         for chunk in read_chunks(f):
  31             response.write(chunk)
  32     return response