It's an old code, sir, but it checks out.

src/bornhack/environment_settings.py.dist

@@ -94,3 +94,5 @@ ACCOUNTINGSYSTEM_EMAIL = "{{ django_accountingsystem_email }}"
 ECONOMYTEAM_EMAIL = "{{ django_economyteam_email }}"
 ECONOMYTEAM_NAME = "Economy"
 
+BORNHACK_2019_OLD_TOKEN_TOKEN = "{{ bornhack_2019_old_token_token }}"
+

src/tokens/templates/token_detail.html

@@ -7,10 +7,18 @@ Secret Token Found! | {{ block.super }}
 {% endblock %}
 
 {% block content %}
-<h3 class="text-center">Secret Token Found!</h3>
-<p class="lead text-center">You found a secret token:</p>
-<p class="lead text-center"><span class="badge">{{ token.description }}</span></p>
-<p class="lead text-center">Your visit has been registered! Keep hunting, there might be more tokens out there.</p>
-<p class="lead text-center"><a href="{% url 'tokens:tokenfind_list' %}">List All Found Tokens</a></p>
+
+{% if view.older_code %}
+    <h3 class="text-center">It's an older code, sir, but it checks out!</h3>
+    <p class="lead text-center">You have tried to use an older token, so here have a token for your efforts!</p>
+    <pre class="lead text-center">{{ view.older_token_token }}</pre>
+{% else %}
+    <h3 class="text-center">Secret Token Found!</h3>
+    <p class="lead text-center">You found a secret token:</p>
+    <p class="lead text-center"><span class="badge">{{ token.description }}</span></p>
+    <p class="lead text-center">Your visit has been registered! Keep hunting, there might be more tokens out there.</p>
+    <p class="lead text-center"><a href="{% url 'tokens:tokenfind_list' %}">List All Found Tokens</a></p>
+{% endif %}
+
 {% endblock %}
 

src/tokens/views.py

@@ -1,6 +1,9 @@
+from django.conf import settings
 from django.contrib.auth.mixins import LoginRequiredMixin
+from django.core.exceptions import ValidationError
 from django.views.generic import ListView, DetailView
 
+from utils.models import CampReadOnlyModeError
 from .models import Token, TokenFind
 
 
@@ -9,13 +12,19 @@ class TokenDetailView(LoginRequiredMixin, DetailView):
     model = Token
     slug_field = "token"
     slug_url_kwarg = "token"
+    older_code = False
 
     def get(self, request, *args, **kwargs):
         # register this tokenview if it isn't already
-        token, created = TokenFind.objects.get_or_create(
-            token=self.get_object(), user=request.user
-        )
-        return super().get(request, *args, **kwargs)
+        try:
+            token, created = TokenFind.objects.get_or_create(
+                token=self.get_object(), user=request.user
+            )
+            return super().get(request, *args, **kwargs)
+        except CampReadOnlyModeError:
+            self.older_code = True
+            self.older_token_token = settings.BORNHACK_2019_OLD_TOKEN_TOKEN
+            return super().get(request, *args, **kwargs)
 
 
 class TokenFindListView(LoginRequiredMixin, ListView):

src/utils/models.py

@@ -47,6 +47,10 @@ class CreatedUpdatedModel(CleanedModel):
     updated = models.DateTimeField(auto_now=True)
 
 
+class CampReadOnlyModeError(ValidationError):
+    pass
+
+
 class CampRelatedModel(CreatedUpdatedModel):
 
     camp_filter = "camp"
@@ -58,7 +62,7 @@ class CampRelatedModel(CreatedUpdatedModel):
         if self.camp.read_only:
             if hasattr(self, "request"):
                 messages.error(self.request, "Camp is in read only mode.")
-            raise ValidationError("This camp is in read only mode.")
+            raise CampReadOnlyModeError("This camp is in read only mode.")
 
         super().save(**kwargs)
 
@@ -66,7 +70,7 @@ class CampRelatedModel(CreatedUpdatedModel):
         if self.camp.read_only:
             if hasattr(self, "request"):
                 messages.error(self.request, "Camp is in read only mode.")
-            raise ValidationError("This camp is in read only mode.")
+            raise CampReadOnlyModeError("This camp is in read only mode.")
 
         super().delete(**kwargs)