Fix/wellknown openid configuration no trailing slash (#1364)

* chore: tests showing configuration error

* fix: Connect Discovery Endpoint redirects

Author: dopry

docs/oidc.rst

@@ -407,7 +407,7 @@ the URLs accordingly.
 ConnectDiscoveryInfoView
 ~~~~~~~~~~~~~~~~~~~~~~~~
 
-Available at ``/o/.well-known/openid-configuration/``, this view provides auto
+Available at ``/o/.well-known/openid-configuration``, this view provides auto
 discovery information to OIDC clients, telling them the JWT issuer to use, the
 location of the JWKs to verify JWTs with, the token and userinfo endpoints to
 query, and other details.

docs/settings.rst

@@ -366,7 +366,7 @@ Default: ``""``
 The URL of the issuer that is used in the ID token JWT and advertised in the
 OIDC discovery metadata. Clients use this location to retrieve the OIDC
 discovery metadata from ``OIDC_ISS_ENDPOINT`` +
-``/.well-known/openid-configuration/``.
+``/.well-known/openid-configuration``.
 
 If unset, the default location is used, eg if ``django-oauth-toolkit`` is
 mounted at ``/o``, it will be ``<server-address>/o``.

oauth2_provider/settings.py

@@ -295,7 +295,7 @@ def oidc_issuer(self, request):
         else:
             raise TypeError("request must be a django or oauthlib request: got %r" % request)
         abs_url = django_request.build_absolute_uri(reverse("oauth2_provider:oidc-connect-discovery-info"))
-        return abs_url[: -len("/.well-known/openid-configuration/")]
+        return abs_url[: -len("/.well-known/openid-configuration")]
 
 
 oauth2_settings = OAuth2ProviderSettings(USER_SETTINGS, DEFAULTS, IMPORT_STRINGS, MANDATORY)

oauth2_provider/urls.py

@@ -31,8 +31,12 @@
 ]
 
 oidc_urlpatterns = [
+    # .well-known/openid-configuration/ is deprecated
+    # https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderConfig
+    # does not specify a trailing slash
+    # Support for trailing slash should shall be removed in a future release.
     re_path(
-        r"^\.well-known/openid-configuration/$",
+        r"^\.well-known/openid-configuration/?$",
         views.ConnectDiscoveryInfoView.as_view(),
         name="oidc-connect-discovery-info",
     ),

tests/test_oidc_views.py

@@ -50,11 +50,37 @@ def test_get_connect_discovery_info(self):
             "token_endpoint_auth_methods_supported": ["client_secret_post", "client_secret_basic"],
             "claims_supported": ["sub"],
         }
-        response = self.client.get(reverse("oauth2_provider:oidc-connect-discovery-info"))
+        response = self.client.get("/o/.well-known/openid-configuration")
+        self.assertEqual(response.status_code, 200)
+        assert response.json() == expected_response
+
+    def test_get_connect_discovery_info_deprecated(self):
+        expected_response = {
+            "issuer": "http://localhost/o",
+            "authorization_endpoint": "http://localhost/o/authorize/",
+            "token_endpoint": "http://localhost/o/token/",
+            "userinfo_endpoint": "http://localhost/o/userinfo/",
+            "jwks_uri": "http://localhost/o/.well-known/jwks.json",
+            "scopes_supported": ["read", "write", "openid"],
+            "response_types_supported": [
+                "code",
+                "token",
+                "id_token",
+                "id_token token",
+                "code token",
+                "code id_token",
+                "code id_token token",
+            ],
+            "subject_types_supported": ["public"],
+            "id_token_signing_alg_values_supported": ["RS256", "HS256"],
+            "token_endpoint_auth_methods_supported": ["client_secret_post", "client_secret_basic"],
+            "claims_supported": ["sub"],
+        }
+        response = self.client.get("/o/.well-known/openid-configuration/")
         self.assertEqual(response.status_code, 200)
         assert response.json() == expected_response
 
-    def expect_json_response_with_rp(self, base):
+    def expect_json_response_with_rp_logout(self, base):
         expected_response = {
             "issuer": f"{base}",
             "authorization_endpoint": f"{base}/authorize/",
@@ -83,7 +109,7 @@ def expect_json_response_with_rp(self, base):
 
     def test_get_connect_discovery_info_with_rp_logout(self):
         self.oauth2_settings.OIDC_RP_INITIATED_LOGOUT_ENABLED = True
-        self.expect_json_response_with_rp(self.oauth2_settings.OIDC_ISS_ENDPOINT)
+        self.expect_json_response_with_rp_logout(self.oauth2_settings.OIDC_ISS_ENDPOINT)
 
     def test_get_connect_discovery_info_without_issuer_url(self):
         self.oauth2_settings.OIDC_ISS_ENDPOINT = None
@@ -117,7 +143,7 @@ def test_get_connect_discovery_info_without_issuer_url_with_rp_logout(self):
         self.oauth2_settings.OIDC_RP_INITIATED_LOGOUT_ENABLED = True
         self.oauth2_settings.OIDC_ISS_ENDPOINT = None
         self.oauth2_settings.OIDC_USERINFO_ENDPOINT = None
-        self.expect_json_response_with_rp("http://testserver/o")
+        self.expect_json_response_with_rp_logout("http://testserver/o")
 
     def test_get_connect_discovery_info_without_rsa_key(self):
         self.oauth2_settings.OIDC_RSA_PRIVATE_KEY = None