"""
Custom S3 storage backend for Garage that returns nginx-proxied URLs.

Instead of returning direct S3 URLs like:
    http://10.10.10.39:3900/nexus-media/uploads/...

Returns relative URLs that go through nginx:
    /api/media/uploads/...

Nginx then handles auth and proxies to Garage's website mode.
"""
from django.conf import settings
from storages.backends.s3boto3 import S3Boto3Storage


class GarageS3Storage(S3Boto3Storage):
    """
    S3Boto3Storage subclass that returns URLs through nginx proxy.
    """

    def url(self, name, parameters=None, expire=None, http_method=None):
        """
        Return a URL that goes through our nginx proxy instead of direct S3.
        """
        # Return relative URL that nginx will proxy to S3
        # MEDIA_URL is '/api/media/' so this becomes '/api/media/uploads/...'
        return f"{settings.MEDIA_URL}{name}"