feat: add qr code with join token

pretalx_musicrate/signals.py

@@ -1,6 +1,24 @@
 from django.dispatch import receiver
 from django.urls import reverse
-from pretalx.orga.signals import nav_event_settings
+from django.utils.translation import gettext_lazy as _
+from pretalx.orga.signals import nav_event, nav_event_settings
+
+
+@receiver(nav_event)
+def pretalx_musicrate_qrcode(sender, request, **kwargs):
+    if not request.user.has_perm("orga.view_submissions", request.event):
+        return []
+    return [
+        {
+            "active": request.resolver_match.url_name
+            == "plugins:pretalx_musicrate:qrcode",
+            "icon": "star",
+            "label": _("Collective Rating"),
+            "url": reverse(
+                "plugins:pretalx_musicrate:qrcode", kwargs={"event": request.event.slug}
+            ),
+        }
+    ]
 
 
 @receiver(nav_event_settings)

pretalx_musicrate/templates/pretalx_musicrate/qrcode.html

@@ -0,0 +1,9 @@
+{% extends "cfp/event/base.html" %}
+{% load qrcode %}
+
+{% block content %}
+    <div class="align-items-center d-flex flex-column justify-content-center">
+        {% qrcode contents %}
+        {{ contents | urlize }}
+    </div>
+{% endblock %}

pretalx_musicrate/templatetags/qrcode.py

@@ -0,0 +1,15 @@
+from django import template
+from django.utils.safestring import mark_safe
+from qrcode import make
+from qrcode.image.svg import SvgPathFillImage
+
+register = template.Library()
+
+
+@register.simple_tag
+def qrcode(data):
+    return mark_safe(
+        make(data, box_size=20, image_factory=SvgPathFillImage)
+        .to_string()
+        .decode("utf-8")
+    )

pretalx_musicrate/urls.py

@@ -1,12 +1,19 @@
-from django.urls import re_path
-from pretalx.event.models.event import SLUG_REGEX
+from django.urls import include, path
 
-from .views import MusicrateSettingsView
+from .views import MusicrateSettingsView, QRCodeView
 
 urlpatterns = [
-    re_path(
-        rf"^orga/event/(?P<event>{SLUG_REGEX})/settings/p/pretalx_musicrate/$",
+    path(
+        "orga/event/<slug:event>/settings/p/pretalx_musicrate/",
         MusicrateSettingsView.as_view(),
         name="settings",
     ),
+    path(
+        "<slug:event>/p/pretalx_musicrate/",
+        include(
+            [
+                path("", QRCodeView.as_view(), name="qrcode"),
+            ]
+        ),
+    ),
 ]

pretalx_musicrate/views.py

@@ -1,12 +1,14 @@
 from django.contrib import messages
+from django.urls import reverse
 from django.utils.translation import gettext_lazy as _
-from django.views.generic import FormView
-from pretalx.common.mixins.views import PermissionRequired
+from django.views.generic import FormView, TemplateView
+from pretalx.common.mixins.views import EventPermissionRequired
+
 
 from .forms import MusicrateSettingsForm
 
 
-class MusicrateSettingsView(PermissionRequired, FormView):
+class MusicrateSettingsView(EventPermissionRequired, FormView):
     permission_required = "orga.change_settings"
     template_name = "pretalx_musicrate/settings.html"
     form_class = MusicrateSettingsForm
@@ -14,9 +16,6 @@ class MusicrateSettingsView(PermissionRequired, FormView):
     def get_success_url(self):
         return self.request.path
 
-    def get_object(self):
-        return self.request.event
-
     def get_form_kwargs(self):
         kwargs = super().get_form_kwargs()
         kwargs["event"] = self.request.event
@@ -28,3 +27,21 @@ class MusicrateSettingsView(PermissionRequired, FormView):
             self.request, _("The pretalx-musicrate settings were updated.")
         )
         return super().form_valid(form)
+
+
+class QRCodeView(EventPermissionRequired, TemplateView):
+    permission_required = "orga.view_submissions"
+    template_name = "pretalx_musicrate/qrcode.html"
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        context["contents"] = self.request.build_absolute_uri(
+            reverse(
+                "plugins:pretalx_musicrate:join",
+                kwargs={
+                    "event": self.request.event.slug,
+                    "token": self.request.event.pretalx_musicrate_settings.join_token,
+                },
+            )
+        )
+        return context

pyproject.toml

@@ -16,6 +16,7 @@ dependencies = [
   "Django",
   "django-i18nfield",
   "pretalx",
+  "qrcode",
 ]
 
 [project.urls]