Selectively apply AWS Headers while uploading static files using django-storages

Question

I want to selectively apply AWS headers based on my file type and filename pattern while uploading them to S3 origin. I am using django-storages with django 1.8.12

I can see the setting AWS_HEADERS in django-storages documentation, but I can't seem to find a way to apply this setting on some files only. I would appreciate if someone can guide me on this

Answer 1

The simplest is to subclass storages.backends.s3boto.S3BotoStorage to introduce the required behavior

from storages.backends.s3boto import S3BotoStorage

class MyS3Storage(S3BotoStorage):

    def _save(self, name, content):
        cleaned_name = self._clean_name(name)
        name = self._normalize_name(cleaned_name)

        _type, encoding = mimetypes.guess_type(name)
        content_type = getattr(content, 'content_type',
                           _type or self.key_class.DefaultContentType)

        # setting the content_type in the key object is not enough.
        self.headers.update({'Content-Type': content_type})


        if re.match('some pattern', cleaned_name) :
            self.headers.update({'new custome header': 'value'})

        if content_type == 'my/content_type':
            self.headers.update({'new custome header': 'value'})

        return super(MyS3Storage, self)._save(name, content)

Don't forget to edit settings and change the file storage definition.

DEFAULT_FILE_STORAGE = 'myapp.MyS3Storage'

The above code is mainly from the S3BotoStorage class with our code merely inspecting the content type and name to add the custom headers.