def _explore_storage(self):
        """Generator of all files contained in media storage."""
        path = ''
        dirs = [path]
        while dirs:
            path = dirs.pop()
            subdirs, files = self.media_storage.listdir(path)
            for media_filename in files:
                yield os.path.join(path, media_filename)
            dirs.extend([os.path.join(path, subdir) for subdir in subdirs])
Generator of all files contained in media storage.