Refactor: remove debug instrumentation from OidcRoleSync

Drop temporary logging used to diagnose OIDC groups sync in dev.

lib/mv/oidc_role_sync.ex

@@ -5,31 +5,29 @@ defmodule Mv.OidcRoleSync do
   Used after OIDC registration (register_with_rauthy) and on sign-in so that
   users in the configured admin group get the Admin role; others get Mitglied.
   Configure via OIDC_ADMIN_GROUP_NAME and OIDC_GROUPS_CLAIM (see OidcRoleSyncConfig).
+
+  Groups are read from user_info (ID token claims) first; if missing or empty,
+  the access_token from oauth_tokens is decoded as JWT and the groups claim is
+  read from there (e.g. Rauthy puts groups in the access token when scope
+  includes "groups").
   """
   alias Mv.Accounts.User
   alias Mv.Authorization.Role
   alias Mv.OidcRoleSyncConfig
 
   @doc """
-  Applies Admin or Mitglied role to the user based on OIDC user_info (groups claim).
+  Applies Admin or Mitglied role to the user based on OIDC groups claim.
 
   - If OIDC_ADMIN_GROUP_NAME is not configured: no-op, returns :ok without changing the user.
-  - If user_info contains the configured admin group (under OIDC_GROUPS_CLAIM): assigns Admin role.
+  - If groups (from user_info or access_token) contain the configured admin group: assigns Admin role.
   - Otherwise: assigns Mitglied role (downgrade if user was Admin).
 
-  user_info is a map (e.g. from JWT claims) and may use string keys. Groups can be
-  a list of strings or a single string.
-
-  ## Examples
-
-      user_info = %{"groups" => ["mila-admin"]}
-      OidcRoleSync.apply_admin_role_from_user_info(user, user_info)
-
-      user_info = %{"ak_groups" => ["other"]}  # with OIDC_GROUPS_CLAIM=ak_groups
-      OidcRoleSync.apply_admin_role_from_user_info(user, user_info)
+  user_info is a map (e.g. from ID token claims); oauth_tokens is optional and may
+  contain "access_token" (JWT) from which the groups claim is read when not in user_info.
   """
-  @spec apply_admin_role_from_user_info(User.t(), map()) :: :ok
-  def apply_admin_role_from_user_info(user, user_info) when is_map(user_info) do
+  @spec apply_admin_role_from_user_info(User.t(), map(), map() | nil) :: :ok
+  def apply_admin_role_from_user_info(user, user_info, oauth_tokens \\ nil)
+      when is_map(user_info) do
     admin_group = OidcRoleSyncConfig.oidc_admin_group_name()
 
     if is_nil(admin_group) or admin_group == "" do
@@ -37,20 +35,72 @@ defmodule Mv.OidcRoleSync do
     else
       claim = OidcRoleSyncConfig.oidc_groups_claim()
       groups = groups_from_user_info(user_info, claim)
+
+      groups =
+        if Enum.empty?(groups), do: groups_from_access_token(oauth_tokens, claim), else: groups
+
       target_role = if admin_group in groups, do: :admin, else: :mitglied
       set_user_role(user, target_role)
     end
   end
 
   defp groups_from_user_info(user_info, claim) do
-    case user_info[claim] do
-      nil -> []
-      list when is_list(list) -> Enum.map(list, &to_string/1)
-      single when is_binary(single) -> [single]
-      _ -> []
+    value = user_info[claim] || user_info[String.to_existing_atom(claim)]
+    normalize_groups(value)
+  rescue
+    ArgumentError -> normalize_groups(user_info[claim])
+  end
+
+  defp groups_from_access_token(nil, _claim), do: []
+  defp groups_from_access_token(oauth_tokens, _claim) when not is_map(oauth_tokens), do: []
+
+  defp groups_from_access_token(oauth_tokens, claim) do
+    access_token = oauth_tokens["access_token"] || oauth_tokens[:access_token]
+
+    if is_binary(access_token) do
+      case peek_jwt_claims(access_token) do
+        {:ok, claims} ->
+          value = claims[claim] || safe_get_atom(claims, claim)
+          normalize_groups(value)
+
+        _ ->
+          []
+      end
+    else
+      []
     end
   end
 
+  defp safe_get_atom(map, key) when is_binary(key) do
+    try do
+      Map.get(map, String.to_existing_atom(key))
+    rescue
+      ArgumentError -> nil
+    end
+  end
+
+  defp safe_get_atom(_map, _key), do: nil
+
+  defp peek_jwt_claims(token) do
+    parts = String.split(token, ".")
+
+    if length(parts) == 3 do
+      [_h, payload_b64, _sig] = parts
+
+      case Base.url_decode64(payload_b64, padding: false) do
+        {:ok, payload} -> Jason.decode(payload)
+        _ -> :error
+      end
+    else
+      :error
+    end
+  end
+
+  defp normalize_groups(nil), do: []
+  defp normalize_groups(list) when is_list(list), do: Enum.map(list, &to_string/1)
+  defp normalize_groups(single) when is_binary(single), do: [single]
+  defp normalize_groups(_), do: []
+
   defp set_user_role(user, :admin) do
     case Role.get_admin_role() do
       {:ok, %Role{} = role} ->