S3BotoStorage subclass for media and static buckets.

settings.py

from __future__ import unicode_literals
import os
from boto.s3.connection import SubdomainCallingFormat

# AWS S3
AWS_S3_ACCESS_KEY_ID = os.getenv('AWS_S3_ACCESS_KEY_ID')
AWS_S3_SECRET_ACCESS_KEY = os.getenv('AWS_S3_SECRET_ACCESS_KEY')

AWS_S3_BASE_URL = 's3.amazonaws.com'
# AWS_S3_FILE_BUFFER_SIZE = 5242880
# AWS_S3_FILE_OVERWRITE = True
# AWS_HEADERS = {}
# AWS_AUTO_CREATE_BUCKET = False
AWS_DEFAULT_ACL = 'public-read'
AWS_BUCKET_ACL = AWS_DEFAULT_ACL
# AWS_QUERYSTRING_AUTH = True
# AWS_QUERYSTRING_EXPIRE = 3600
# AWS_REDUCED_REDUNDANCY = False
# AWS_LOCATION = ''
# AWS_S3_ENCRYPTION = False
# AWS_S3_CUSTOM_DOMAIN = None
# AWS_S3_CALLING_FORMAT = SubdomainCallingFormat()
# AWS_S3_SECURE_URLS = True
# AWS_S3_FILE_NAME_CHARSET = 'utf-8'
# AWS_PRELOAD_METADATA = False
AWS_S3_URL_PROTOCOL = 'http:'
AWS_IS_GZIPPED = True
GZIP_CONTENT_TYPES = (
    'text/css',
    'application/javascript',
    'application/x-javascript',
)

# Media
DEFAULT_FILE_STORAGE = 'storages.backends.s3boto.S3BotoStorage'
AWS_STORAGE_BUCKET_NAME = 'media.site.com'
# AWS_S3_CUSTOM_DOMAIN = AWS_STORAGE_BUCKET_NAME
MEDIA_URL = '%s//%s.%s/' % (AWS_S3_URL_PROTOCOL, AWS_STORAGE_BUCKET_NAME, AWS_S3_BASE_URL)

# Static
STATICFILES_STORAGE = 'path.to.storage.S3StaticStorage'
AWS_STATIC_BUCKET_NAME = 'static.site.com'
# AWS_STATIC_CUSTOM_DOMAIN = AWS_STATIC_BUCKET_NAME
STATIC_URL = '%s//%s.%s/' % (AWS_S3_URL_PROTOCOL, AWS_STATIC_BUCKET_NAME, AWS_S3_BASE_URL)
STATICFILES_DIRS = (
    os.path.join(BASE_DIR, 'static'),
)
STATICFILES_FINDERS = (
    'django.contrib.staticfiles.finders.FileSystemFinder',
    'django.contrib.staticfiles.finders.AppDirectoriesFinder',
)

static_storage.py

from django.conf import settings
from storages.backends.s3boto import S3BotoStorage


class S3StaticStorage(S3BotoStorage):
    "S3 storage backend that sets the static bucket."
    def __init__(self, *args, **kwargs):
        super(S3StaticStorage, self).__init__(bucket=settings.AWS_STATIC_BUCKET_NAME,
                                              custom_domain=settings.AWS_STATIC_CUSTOM_DOMAIN,
                                              *args, **kwargs)