import base64
import io
import json

import qrcode


def build_qr_payload(qr_token: str) -> str:
    return json.dumps({"v": 1, "token": qr_token}, separators=(",", ":"))


def qr_png_base64(data: str) -> str:
    image = qrcode.make(data, box_size=8, border=2)
    buffer = io.BytesIO()
    image.save(buffer, format="PNG")
    return base64.b64encode(buffer.getvalue()).decode("ascii")