Merge pull request #136 from atdsaa/custom_error_handler

Custom error handler

CHANGELOG.rst

@@ -1,6 +1,14 @@
 Changelog
 =========
 
+`1.6.0`_ - 2021-01-25
+---------------------
+
+**Features**
+
+* New parameter called `CUSTOM_FAILED_RESPONSE_VIEW`, allowing you to set a custom django function view to handle login
+  failures. #136
+
 
 `1.5.0`_ - 2021-01-18
 ---------------------
@@ -219,6 +227,7 @@ Changelog
 
 * Initial release
 
+.. _1.6.0: https://github.com/snok/django-auth-adfs/compare/1.5.0...1.6.0
 .. _1.5.0: https://github.com/jobec/django-auth-adfs/compare/1.4.1...1.5.0
 .. _1.4.1: https://github.com/jobec/django-auth-adfs/compare/1.4.0...1.4.1
 .. _1.4.0: https://github.com/jobec/django-auth-adfs/compare/1.3.1...1.4.0

django_auth_adfs/__init__.py

@@ -4,4 +4,4 @@
 Adding imports here will break setup.py
 """
 
-__version__ = '1.5.0'
+__version__ = '1.6.0'

django_auth_adfs/config.py

@@ -14,13 +14,15 @@
 from django.contrib.auth import get_user_model
 from django.core.exceptions import ImproperlyConfigured
 from django.http import QueryDict
+from django.shortcuts import render
 from django.utils.module_loading import import_string
 
 try:
     from django.urls import reverse
 except ImportError:  # Django < 1.10
     from django.core.urlresolvers import reverse
 
+
 logger = logging.getLogger("django_auth_adfs")
 
 AZURE_AD_SERVER = "login.microsoftonline.com"
@@ -69,6 +71,9 @@ def __init__(self):
         self.TIMEOUT = 5
         self.USERNAME_CLAIM = "winaccountname"
         self.JWT_LEEWAY = 0
+        self.CUSTOM_FAILED_RESPONSE_VIEW = lambda request, error_message, status: render(
+            request, 'django_auth_adfs/login_failed.html', {'error_message': error_message}, status=status
+        )
 
         required_settings = [
             "AUDIENCE",
@@ -151,6 +156,10 @@ def __init__(self):
                 msg = "django_auth_adfs setting '{0}' has not been set".format(setting)
                 raise ImproperlyConfigured(msg)
 
+        # Setup dynamic settings
+        if not callable(self.CUSTOM_FAILED_RESPONSE_VIEW):
+            self.CUSTOM_FAILED_RESPONSE_VIEW = import_string(self.CUSTOM_FAILED_RESPONSE_VIEW)
+
         # Validate setting conflicts
         usermodel = get_user_model()
         if usermodel.USERNAME_FIELD in self.CLAIM_MAPPING.keys():

django_auth_adfs/views.py

@@ -3,11 +3,11 @@
 
 from django.conf import settings as django_settings
 from django.contrib.auth import authenticate, login, logout
-from django.shortcuts import redirect, render
+from django.shortcuts import redirect
 from django.utils.http import is_safe_url
 from django.views.generic import View
 
-from django_auth_adfs.config import provider_config
+from django_auth_adfs.config import provider_config, settings
 from django_auth_adfs.exceptions import MFARequired
 
 logger = logging.getLogger("django_auth_adfs")
@@ -25,9 +25,11 @@ def get(self, request):
         code = request.GET.get("code")
         if not code:
             # Return an error message
-            return render(request, 'django_auth_adfs/login_failed.html', {
-                'error_message': "No authorization code was provided.",
-            }, status=400)
+            return settings.CUSTOM_FAILED_RESPONSE_VIEW(
+                request,
+                error_message="No authorization code was provided.",
+                status=400
+            )
 
         redirect_to = request.GET.get("state")
         try:
@@ -54,14 +56,18 @@ def get(self, request):
                 return redirect(redirect_to)
             else:
                 # Return a 'disabled account' error message
-                return render(request, 'django_auth_adfs/login_failed.html', {
-                    'error_message': "Your account is disabled.",
-                }, status=403)
+                return settings.CUSTOM_FAILED_RESPONSE_VIEW(
+                    request,
+                    error_message="Your account is disabled.",
+                    status=403
+                )
         else:
             # Return an 'invalid login' error message
-            return render(request, 'django_auth_adfs/login_failed.html', {
-                'error_message': "Login failed.",
-            }, status=401)
+            return settings.CUSTOM_FAILED_RESPONSE_VIEW(
+                request,
+                error_message="Login failed.",
+                status=401
+            )
 
 
 class OAuth2LoginView(View):

docs/install.rst

@@ -83,6 +83,9 @@ In your project's ``settings.py`` add these settings.
         'django_auth_adfs.middleware.LoginRequiredMiddleware',
     )
 
+    # You can point login failures to a custom Django function based view for customization of the UI
+    CUSTOM_FAILED_RESPONSE_VIEW = 'dot.path.to.custom.views.login_failed'
+
 In your project's ``urls.py`` add these paths:
 
 .. code-block:: python

docs/settings_ref.rst

@@ -180,6 +180,24 @@ Allows you to set a leeway of the JWT token. See the official
 `PyJWT <https://pyjwt.readthedocs.io/en/stable/usage.html>`__ docs for more information.
 
 
+CUSTOM_FAILED_RESPONSE_VIEW
+--------------------------------
+* **Default**: ``lambda``
+* **Type**: ``str`` or ``callable``
+
+Allows you to set a custom django function view to handle login failures. Can be a dot path to your
+Django function based view function or a callable.
+
+Callable must have the following method signature accepting ``error_message`` and ``status`` arguments:
+
+.. code-block:: python
+
+    def failed_response(request, error_message, status):
+        # Return an error message
+        return render(request, 'myapp/login_failed.html', {
+            'error_message': error_message,
+        }, status=status)
+
 
 GROUP_CLAIM
 -----------

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = 'django-auth-adfs'
-version = '1.5.0'  # Remember to also change __init__.py version
+version = '1.6.0'  # Remember to also change __init__.py version
 description = 'A Django authentication backend for Microsoft ADFS and AzureAD'
 authors = ['Joris Beckers <[email protected]>']
 maintainers = ['Jonas Krüger Svensson <[email protected]>', 'Sondre Lillebø Gundersen <[email protected]>']

tests/test_settings.py

@@ -41,6 +41,19 @@ def test_required_setting(self):
         with patch("django_auth_adfs.config.django_settings", settings):
             self.assertRaises(ImproperlyConfigured, Settings)
 
+    def test_default_failed_response_setting(self):
+        settings = deepcopy(django_settings)
+        with patch("django_auth_adfs.config.django_settings", settings):
+            s = Settings()
+            self.assertTrue(callable(s.CUSTOM_FAILED_RESPONSE_VIEW))
+
+    def test_dotted_path_failed_response_setting(self):
+        settings = deepcopy(django_settings)
+        settings.AUTH_ADFS["CUSTOM_FAILED_RESPONSE_VIEW"] = 'tests.views.test_failed_response'
+        with patch("django_auth_adfs.config.django_settings", settings):
+            s = Settings()
+            self.assertTrue(callable(s.CUSTOM_FAILED_RESPONSE_VIEW))
+
 
 class CustomSettingsTests(SimpleTestCase):
     def setUp(self):

tests/views.py

@@ -0,0 +1,2 @@
+def test_failed_response(request, error_message, status):
+    pass