Unable to use ByteArray value received

Question

I'm developing a soap web server with spyne. I've defined the following method inside a Service class:

@rpc(String, String, String, String, String, DateTime, String, String,
         String, Integer32, ByteArray, _returns=ResponseCode)
    def add_ticket(ctx, t_id, text, cat1, cat2, cat3, date, user, service, attachment1_name, attachment1_size, attachment1_data):
        logging.info(f"Received ticket: {t_id} with category {cat1}/{cat2}/{cat3} under service {service}")

        logging.info(f"Attachment 1: {attachment1_data}")

Anyway I'm sending some simple pdf file encoded in base64 in the ByteArray field, but I'm receiving a tuple. Is there a way to mantain or even re-encode in base64 what is received?

For example, I'm sending something that start with:

JVBERi0xLjMNCiXi48/TDQoNCjEgMCBvYmoNCjw8DQovVHlwZSAvQ2F0YWxvZw0KL091dGxpb[...]

and receiving something that starts with:

(b'%PDF-1.4\n%\xc3\xa4\xc3\xbc\xc3\xb6\xc3\x9f\n2 0 obj\n<</Length 3 0 R/Filter/FlateDecode>>\nstream\nx\x9c\xad\x1aM\x8b[...]

I've read the answer in this stack overflow question: python spyne service - base64 strings come escaped but it doesn't resolve my problem. I'm not able to define the deserialization method for ByteArray.

The option 2 in the answer is not the best that I can implement because in my wsdl file to share there would be

<xs:element name="attachment1_data" type="tns:add_ticket_attachment1_dataType" minOccurs="0" nillable="true" />

that is not a feasible data type name.

Thanks in advance!

Answer 1

ByteArray is used to abstract away binary encoding differences in different protocols. That's why you get a sequence of bytes objects, as documented here.

If you want the base64 string, just use the Unicode type.

If you want the base64 string yet you NEED to use ByteArray, you can try using ByteArray(encoding=None), or subclassing the protocol and overriding the byte_array_from_element function