Add support for OIDC (#389)

* added support for oidc auth

* fixed oidc usernames

* hiding password for users that aren't logged in via local auth

* add dependency, update settings

* keep change password link

* add tests

* add docs

---------

Co-authored-by: Sascha Ißbrücker <sascha.issbruecker@gmail.com>

bookmarks/tests/test_login_view.py

@@ -0,0 +1,29 @@
+from django.test import TestCase, override_settings
+from django.urls import path, include
+
+from bookmarks.tests.helpers import HtmlTestMixin
+from siteroot.urls import urlpatterns as base_patterns
+
+# Register OIDC urls for this test, otherwise login template can not render when OIDC is enabled
+urlpatterns = base_patterns + [path("oidc/", include("mozilla_django_oidc.urls"))]
+
+
+@override_settings(ROOT_URLCONF=__name__)
+class LoginViewTestCase(TestCase, HtmlTestMixin):
+
+    def test_should_not_show_oidc_login_by_default(self):
+        response = self.client.get("/login/")
+        soup = self.make_soup(response.content.decode())
+
+        oidc_login_link = soup.find("a", text="Login with OIDC")
+
+        self.assertIsNone(oidc_login_link)
+
+    @override_settings(LD_ENABLE_OIDC=True)
+    def test_should_show_oidc_login_when_enabled(self):
+        response = self.client.get("/login/")
+        soup = self.make_soup(response.content.decode())
+
+        oidc_login_link = soup.find("a", text="Login with OIDC")
+
+        self.assertIsNotNone(oidc_login_link)