Add prompt=none support (#1268)

AUTHORS

@@ -22,6 +22,7 @@ Allisson Azevedo
 Andrea Greco
 Andrej Zbín
 Andrew Chen Wang
+Andrew Zickler
 Antoine Laurent
 Anvesh Agarwal
 Aristóbulo Meneses

CHANGELOG.md

@@ -26,6 +26,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * #1311 Add option to disable client_secret hashing to allow verifying JWTs' signatures.
 * #1337 Gracefully handle expired or deleted refresh tokens, in `validate_user`.
 * #1350 Support Python 3.12 and Django 5.0
+* #1268 Support prompt=none in authentication request for Silent Authentication
 
 ### Fixed
 * #1322 Instructions in documentation on how to create a code challenge and code verifier

oauth2_provider/views/base.py

@@ -244,6 +244,33 @@ def handle_prompt_login(self):
             self.get_redirect_field_name(),
         )
 
+    def handle_no_permission(self):
+        """
+        Generate response for unauthorized users.
+
+        If prompt is set to none, then we redirect with an error code
+        as defined by OIDC 3.1.2.6
+
+        Some code copied from OAuthLibMixin.error_response, but that is designed
+        to operated on OAuth1Error from oauthlib wrapped in a OAuthToolkitError
+        """
+        prompt = self.request.GET.get("prompt")
+        redirect_uri = self.request.GET.get("redirect_uri")
+        if prompt == "none" and redirect_uri:
+            response_parameters = {"error": "login_required"}
+
+            # REQUIRED if the Authorization Request included the state parameter.
+            # Set to the value received from the Client
+            state = self.request.GET.get("state")
+            if state:
+                response_parameters["state"] = state
+
+            separator = "&" if "?" in redirect_uri else "?"
+            redirect_to = redirect_uri + separator + urlencode(response_parameters)
+            return self.redirect(redirect_to, application=None)
+        else:
+            super().handle_no_permission()
+
 
 @method_decorator(csrf_exempt, name="dispatch")
 class TokenView(OAuthLibMixin, View):

tests/test_authorization_code.py

@@ -645,6 +645,33 @@ def test_prompt_login(self):
 
         self.assertNotIn("prompt=login", next)
 
+    def test_prompt_none_unauthorized(self):
+        """
+        Test response for redirect when supplied with prompt: none
+
+        Should redirect to redirect_uri with an error of login_required
+        """
+        self.oauth2_settings.PKCE_REQUIRED = False
+
+        query_data = {
+            "client_id": self.application.client_id,
+            "response_type": "code",
+            "state": "random_state_string",
+            "scope": "read write",
+            "redirect_uri": "http://example.org",
+            "prompt": "none",
+        }
+
+        response = self.client.get(reverse("oauth2_provider:authorize"), data=query_data)
+
+        self.assertEqual(response.status_code, 302)
+
+        scheme, netloc, path, params, query, fragment = urlparse(response["Location"])
+        parsed_query = parse_qs(query)
+
+        self.assertIn("login_required", parsed_query["error"])
+        self.assertIn("random_state_string", parsed_query["state"])
+
 
 class BaseAuthorizationCodeTokenView(BaseTest):
     def get_auth(self, scope="read write"):