Better photo authorization upload

apps/registration/views.py

@@ -1,3 +1,10 @@
+import mimetypes
+import os
+
+from django.http import Http404, HttpResponse, FileResponse
+from django.views.generic.base import View
+from magic import Magic
+
 from corres2math.tokens import email_validation_token
 from django.conf import settings
 from django.contrib.auth.mixins import LoginRequiredMixin
@@ -164,5 +171,26 @@ class UserUploadPhotoAuthorizationView(LoginRequiredMixin, UpdateView):
     form_class = PhotoAuthorizationForm
     template_name = "registration/upload_photo_authorization.html"
 
+    @transaction.atomic
+    def form_valid(self, form):
+        old_instance = StudentRegistration.objects.get(pk=self.object.pk)
+        if old_instance.photo_authorization:
+            old_instance.photo_authorization.delete()
+        return super().form_valid(form)
+
     def get_success_url(self):
         return reverse_lazy("registration:user_detail", args=(self.object.user.pk,))
+
+
+class PhotoAuthorizationView(LoginRequiredMixin, View):
+    def get(self, request, *args, **kwargs):
+        filename = kwargs["filename"]
+        path = f"media/authorization/photo/{filename}"
+        if not os.path.exists(path):
+            raise Http404
+        student = StudentRegistration.objects.get(photo_authorization__endswith=filename)
+        mime = Magic(mime=True)
+        mime_type = mime.from_file(path)
+        ext = mime_type.split("/")[1].replace("jpeg", "jpg")
+        true_file_name = _("Photo authorization of {student}.{ext}").format(student=str(student), ext=ext)
+        return FileResponse(open(path, "rb"), content_type=mime_type, filename=true_file_name)