image_tools.py 文件源码

def image_url(attachment, suffix):
    '''Return url of an image given size(@param suffix)
    e.g large, medium, small, or generate required thumbnail
    '''
    url = attachment.media_file.url
    if suffix == 'original':
        return url
    else:
        default_storage = get_storage_class()()
        fs = get_storage_class('django.core.files.storage.FileSystemStorage')()
        if suffix in settings.THUMB_CONF:
            size = settings.THUMB_CONF[suffix]['suffix']
            filename = attachment.media_file.name
            if default_storage.exists(filename):
                if default_storage.exists(get_path(filename, size)) and\
                        default_storage.size(get_path(filename, size)) > 0:
                    url = default_storage.url(
                        get_path(filename, size))
                else:
                    if default_storage.__class__ != fs.__class__:
                        resize(filename)
                    else:
                        resize_local_env(filename)
                    return image_url(attachment, suffix)
            else:
                return None
    return url