Method data_open

Lib/urllib/request.py:1622–1654

(self, req)

class DataHandler(BaseHandler):
    def data_open(self, req):
        # data URLs as specified in RFC 2397.
        #
        # ignores POSTed data
        #
        # syntax:
        # dataurl   := "data:" [ mediatype ] [ ";base64" ] "," data
        # mediatype := [ type "/" subtype ] *( ";" parameter )
        # data      := *urlchar
        # parameter := attribute "=" value
        url = req.full_url

        scheme, data = url.split(":",1)
        mediatype, data = data.split(",",1)

        # Disallow control characters within mediatype.
        if re.search(r"[\x00-\x1F\x7F]", mediatype):
            raise ValueError(
                "Control characters not allowed in data: mediatype")

        # even base64 encoded data URLs might be quoted so unquote in any case:
        data = unquote_to_bytes(data)
        if mediatype.endswith(";base64"):
            data = base64.decodebytes(data)
            mediatype = mediatype[:-7]

        if not mediatype:
            mediatype = "text/plain;charset=US-ASCII"

        headers = email.message_from_string("Content-type: %s\nContent-length: %d\n" %
            (mediatype, len(data)))

        return addinfourl(io.BytesIO(data), headers, url)


# Code moved from the old urllib module