dir: Use new AccountsService feature to get languages

Use the new GetUsersLanguages() method from AccountsService to get the
list of all the locales that each user is interested in.

See https://gitlab.freedesktop.org/accountsservice/accountsservice/-/merge_requests/99

Closes: #5006

common/flatpak-dir.c

@@ -16081,6 +16081,45 @@ get_accounts_dbus_proxy (void)
  NULL);
 }
 
+static gboolean
+get_all_langs_from_accounts_dbus (GDBusProxy *proxy, GPtrArray *langs)
+{
+ g_auto(GStrv) all_langs = NULL;
+ int i;
+ g_autoptr(GVariant) ret = NULL;
+ g_autoptr(GError) error = NULL;
+
+ ret = g_dbus_proxy_call_sync (G_DBUS_PROXY (proxy),
+ "GetUsersLanguages",
+ g_variant_new ("()"),
+ G_DBUS_CALL_FLAGS_NONE,
+ -1,
+ NULL,
+ &error);
+ if (!ret)
+ {
+ g_debug ("Failed to get languages for all users: %s", error->message);
+ return FALSE;
+ }
+
+ g_variant_get (ret,
+ "(^as)",
+ &all_langs);
+
+ if (all_langs != NULL)
+ {
+ for (i = 0; all_langs[i] != NULL; i++)
+ {
+ g_autofree char *lang = NULL;
+ lang = flatpak_get_lang_from_locale (all_langs[i]);
+ if (lang != NULL && !flatpak_g_ptr_array_contains_string (langs, lang))
+ g_ptr_array_add (langs, g_steal_pointer (&lang));
+ }
+ }
+
+ return TRUE;
+}
+
 static void
 get_locale_langs_from_accounts_dbus (GDBusProxy *proxy, GPtrArray *langs)
 {
@@ -16179,20 +16218,24 @@ get_system_locales (FlatpakDir *self)
  g_autoptr(GDBusProxy) localed_proxy = NULL;
  g_autoptr(GDBusProxy) accounts_proxy = NULL;
 
- /* Get the system default locales */
- localed_proxy = get_localed_dbus_proxy ();
- if (localed_proxy != NULL)
- get_locale_langs_from_localed_dbus (localed_proxy, langs);
-
- /* Now add the user account locales from AccountsService. If accounts_proxy is
- * not NULL, it means that AccountsService exists */
  accounts_proxy = get_accounts_dbus_proxy ();
- if (accounts_proxy != NULL)
- get_locale_langs_from_accounts_dbus (accounts_proxy, langs);
+ if (!get_all_langs_from_accounts_dbus (accounts_proxy, langs))
+ {
 
- g_ptr_array_add (langs, NULL);
+ /* Get the system default locales */
+ localed_proxy = get_localed_dbus_proxy ();
+ if (localed_proxy != NULL)
+ get_locale_langs_from_localed_dbus (localed_proxy, langs);
 
- g_once_init_leave (&cached, langs);
+ /* Now add the user account locales from AccountsService. If accounts_proxy is
+ * not NULL, it means that AccountsService exists */
+ if (accounts_proxy != NULL)
+ get_locale_langs_from_accounts_dbus (accounts_proxy, langs);
+
+ g_ptr_array_add (langs, NULL);
+
+ g_once_init_leave (&cached, langs);
+ }
  }
 
  return (const GPtrArray *)cached;