media_url.py

"""Utils for the media files."""
from django.conf import settings

from django.contrib.sites.models import Site

from django.utils.functional import lazy


def generate_abs_media_url():
    """Return the absolute media URL.
    One problem of the media URL is, that the end user
    can configure this in a relative way. THis works for the
    django templates, but is problematic for the channels and REST
    users.
    Returns:
        str: The absolute media URL.
    """
    media_url = getattr(settings, 'MEDIA_URL')

    http_check = media_url.startswith('http')
    if http_check:
        return media_url

    # Generate the complete URL
    protocol = getattr(settings, 'DEFAULT_HTTP_PROTOCOL', 'http')
    return "{protocol}://{domain}{media}".format(
        protocol=protocol, domain=Site.objects.get_current(), media=media_url)


absolute_media_url = lazy(generate_abs_media_url, str)