apps: display appstore badges based on UA

* on iPhone, only AppStore badge displays
* on Android, only PlayStore badge displays
* on any other platform, both display

apps/member/views.py

@@ -50,6 +50,15 @@ class CustomLoginView(LoginView):
         self.request.session['permission_mask'] = form.cleaned_data['permission_mask'].rank
         return super().form_valid(form)
 
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        user_agent = self.request.META.get('HTTP_USER_AGENT', '').lower()
+
+        context['display_appstore_badge'] = 'iphone' in user_agent or 'android' not in user_agent
+        context['display_playstore_badge'] = 'android' in user_agent or 'iphone' not in user_agent
+
+        return context
+
 
 class UserUpdateView(ProtectQuerysetMixin, LoginRequiredMixin, UpdateView):
     """

note_kfet/templates/registration/login.html

@@ -41,14 +41,18 @@ SPDX-License-Identifier: GPL-2.0-or-later
         </form>
 
         <div class="text-center mt-4">
+            {% if display_appstore_badge %}
             <a href="https://apps.apple.com/fr/app/la-note-kfet/id6754661723" class="d-inline-block mx-1" aria-label="{% trans 'Download on the AppStore' %}" style="cursor: pointer;">
                 <img src="/static/img/appstore_badge_fr.svg"
                      alt="{% trans 'Download on the AppStore' %}" style="height: 50px;">
             </a>
+            {% endif %}
+            {% if display_playstore_badge %}
             <a href="https://play.google.com/store/apps/details?id=org.crans.bde.note&hl=fr" class="d-inline-block mx-1" aria-label="{% trans 'Get it on Google Play' %}" style="cursor: pointer;">
                 <img src="/static/img/playstore_badge_fr.svg"
                      alt="{% trans 'Get it on Google Play' %}" style="height: 50px;">
             </a>
+            {% endif %}
         </div>
     </div>
 </div>