download.py 文件源码

def __init__(self, request, stream, filename=None, *args, **kwargs):
        if isinstance(stream, str):
            stream = open(stream, 'rb')

        super().__init__(streaming_content=stream, *args, **kwargs)

        # filename
        if filename is None:
            if hasattr(stream, 'name'):
                filename = os.path.basename(stream.name)
            else:
                filename = 'file'

        # size
        if isinstance(stream, File):
            self['Content-Length'] = stream.size
        elif hasattr(stream, 'name'):
            self['Content-Length'] = os.path.getsize(stream.name)

        type_name, encoding = mimetypes.guess_type(filename)
        if type_name is None:
            type_name = 'application/octet-stream'
        self['Content-Type'] = type_name
        if encoding is not None:
            self['Content-Encoding'] = encoding

        # To inspect details for the below code, see http://greenbytes.de/tech/tc2231/
        if 'HTTP_USER_AGENT' in request.META and 'MSIE' in request.META['HTTP_USER_AGENT']:
            # IE does not support internationalized filename at all.
            # It can only recognize internationalized URL, so we do the trick via routing rules.
            filename_header = ''
        else:
            # For others like Firefox, we follow RFC2231 (encoding extension in HTTP headers).
            filename_header = 'filename*=UTF-8\'\'%s' % quote(filename)

        self['Content-Disposition'] = 'attachment; ' + filename_header