code: def publish(request):
      
      if 'epub' not in request.POST:
          raise httpexceptions.HTTPBadRequest("Missing EPUB in POST body.")
  
      is_pre_publication = asbool(request.POST.get('pre-publication'))
      epub_upload = request.POST['epub'].file
      try:
          epub = cnxepub.EPUB.from_file(epub_upload)
      except:  # noqa: E722
          raise httpexceptions.HTTPBadRequest('Format not recognized.')
  
      # Make a publication entry in the database for status checking
      # the publication. This also creates publication entries for all
      # of the content in the EPUB.
      with db_connect() as db_conn:
          with db_conn.cursor() as cursor:
              epub_upload.seek(0)
              publication_id, publications = add_publication(
                  cursor, epub, epub_upload, is_pre_publication)
  
      # Poke at the publication & lookup its state.
      state, messages = poke_publication_state(publication_id)
  
      response_data = {
          'publication': publication_id,
          'mapping': publications,
          'state': state,
          'messages': messages,
      }
      return response_data
docs: Accept a publication request at form value 'epub