encoding query string

I am trying to generate endpoint and stubs using open api generator.

For many of the endpoints, the api uses a single query parameter which is a filter object – holding the actual parameters – that is base64-encoded.

How to set up yam file so that I it will generate something like this.

    @GetMapping("/filter")
    String home(@RequestParam() String input) {
        RequesObj o = decode(input);
        ...
    }

}

Steps

• 1. Send the encoded JSON as request param (/filter?input=SGVsbG8gV29ybGQh....).
• 2. On the server-side, decode q.
• 3. Deserialize the JSON string