feat: distribute qrcode image over api/me/qrcode

apps/api/views.py

@@ -1,13 +1,19 @@
 # Copyright (C) 2018-2025 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
+import base64
+import os
+from io import BytesIO
+import qrcode
+import pyotp
 
 from django.contrib.auth.models import User
-from rest_framework.generics import RetrieveAPIView
+from django.http.response import HttpResponse
+from rest_framework import viewsets, mixins
 
 from .serializers import OAuthSerializer
 
 
-class UserInformationView(RetrieveAPIView):
+class UserInformationView(mixins.RetrieveModelMixin, viewsets.GenericViewSet):
     """
     These fields are give to OAuth authenticators.
     """
@@ -18,3 +24,11 @@ class UserInformationView(RetrieveAPIView):
 
     def get_object(self):
         return self.request.user
+
+    def qrcode(self, request, *args, **kwargs):
+        secret = base64.b32encode(os.getenv("DJANGO_SECRET_KEY").encode())
+        qr_img = qrcode.make(f"{str(request.user.username)}{pyotp.TOTP(secret, interval=30).now()}")
+        buffer = BytesIO()
+        qr_img.save(buffer, format="PNG")
+        buffer.seek(0)
+        return HttpResponse(buffer, content_type="image/png")