Feature: OIDC & social authentication (#5190)

---------

Co-authored-by: Moritz Pflanzer <moritz@chickadee-engineering.com>
Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src/paperless/adapter.py

@@ -0,0 +1,30 @@
+from allauth.account.adapter import DefaultAccountAdapter
+from allauth.socialaccount.adapter import DefaultSocialAccountAdapter
+from django.conf import settings
+from django.urls import reverse
+
+
+class CustomAccountAdapter(DefaultAccountAdapter):
+    def is_open_for_signup(self, request):
+        allow_signups = super().is_open_for_signup(request)
+        # Override with setting, otherwise default to super.
+        return getattr(settings, "ACCOUNT_ALLOW_SIGNUPS", allow_signups)
+
+
+class CustomSocialAccountAdapter(DefaultSocialAccountAdapter):
+    def is_open_for_signup(self, request, sociallogin):
+        allow_signups = super().is_open_for_signup(request, sociallogin)
+        # Override with setting, otherwise default to super.
+        return getattr(settings, "SOCIALACCOUNT_ALLOW_SIGNUPS", allow_signups)
+
+    def get_connect_redirect_url(self, request, socialaccount):
+        """
+        Returns the default URL to redirect to after successfully
+        connecting a social account.
+        """
+        url = reverse("base")
+        return url
+
+    def populate_user(self, request, sociallogin, data):
+        # TODO: If default global permissions are implemented, should also be here
+        return super().populate_user(request, sociallogin, data)  # pragma: no cover