common: add http403 handler

circle/circle/urls.py

@@ -88,3 +88,4 @@ if get_env_variable('DJANGO_SAML', 'FALSE') == 'TRUE':
     )
 
 handler500 = 'common.views.handler500'
+handler403 = 'common.views.handler403'

circle/common/views.py

@@ -19,32 +19,42 @@ from sys import exc_info
 
 import logging
 
-from django.template import RequestContext
 from django.shortcuts import render_to_response
+from django.template import RequestContext
 
 from .models import HumanReadableException
 
 logger = logging.getLogger(__name__)
 
 
-def handler500(request):
-    cls, exception, traceback = exc_info()
-    logger.exception("unhandled exception")
+def get_context(request, exception):
     ctx = {}
-    if isinstance(exception, HumanReadableException):
+    if issubclass(exception.__class__, HumanReadableException):
         try:
-            ctx['error'] = exception.get_user_text()
-        except:
-            pass
-        else:
-            try:
-                if request.user.is_superuser():
+            if request.user.is_superuser:
                 ctx['error'] = exception.get_admin_text()
+            else:
+                ctx['error'] = exception.get_user_text()
         except:
             pass
+    return ctx
+
+
+def handler500(request):
+    cls, exception, traceback = exc_info()
+    logger.exception("unhandled exception")
+    ctx = get_context(request, exception)
     try:
         resp = render_to_response("500.html", ctx, RequestContext(request))
     except:
         resp = render_to_response("500.html", ctx)
     resp.status_code = 500
     return resp
+
+
+def handler403(request):
+    cls, exception, traceback = exc_info()
+    ctx = get_context(request, exception)
+    resp = render_to_response("403.html", ctx)
+    resp.status_code = 403
+    return resp

circle/templates/403.html

+{% extends "base.html" %}
+{% load i18n %}
+
+{% block title %}HTTP 403{% endblock %}
+
+{% block page_title %}{% trans ":(" %}{% endblock page_title %}
+
+{% block content %}
+<div class="alert alert-danger" style="font-size: 22px; margin-top: 2em;">
+  <div class="row">
+    <div class="col-md-2" style="text-align: center;">
+      HTTP 403
+    </div>
+    <div class="col-md-10" style="text-align: center;">
+      {% if error %}
+        {{ error }}
+      {% else %}
+       {% trans "Forbidden" %}
+      {% endif %}
+    </div>
+  </div>
+</div>
+{% endblock content %}

circle/templates/500.html

-{% extends "dashboard/base.html" %}
+{% extends "base.html" %}
 {% load i18n %}
 
 {% block title %}HTTP 500{% endblock %}