From 4fc222ac3b78f0f38871b0f87f35825764b41cfa Mon Sep 17 00:00:00 2001
From: LinXuan Jiang <droiing@foxmail.com>
Date: Fri, 25 Aug 2017 20:25:09 +0800
Subject: [PATCH] Get language list from AccountsService's dbus (#973)

* Get language list from AccountsService's dbus

Fixes issue #950

When xa.languages is not set in repo config, system installs will
get language list from AccountsService's dbus.
---
 common/flatpak-dir.c | 165 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 164 insertions(+), 1 deletion(-)

diff --git a/common/flatpak-dir.c b/common/flatpak-dir.c
index 747bdc44..2a73817f 100644
--- a/common/flatpak-dir.c
+++ b/common/flatpak-dir.c
@@ -9696,6 +9696,154 @@ flatpak_dir_find_local_related (FlatpakDir *self,
   return g_steal_pointer (&related);
 }
 
+static GDBusProxy *
+get_accounts_dbus_proxy (void)
+{
+  GDBusConnection *conn = NULL;
+  GDBusProxy *proxy = NULL;
+
+  const char *accounts_bus_name = "org.freedesktop.Accounts";
+  const char *accounts_object_path = "/org/freedesktop/Accounts";
+  const char *accounts_interface_name = accounts_bus_name;
+
+  conn = g_bus_get_sync (G_BUS_TYPE_SYSTEM, NULL, NULL);
+  proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
+                                         G_DBUS_PROXY_FLAGS_NONE,
+                                         NULL,
+                                         accounts_bus_name,
+                                         accounts_object_path,
+                                         accounts_interface_name,
+                                         NULL,
+                                         NULL);
+  g_object_unref (conn);
+
+  return proxy;
+}
+
+static char **
+get_locale_subpaths_from_accounts_dbus (GDBusProxy *proxy)
+{
+  const char *accounts_bus_name = "org.freedesktop.Accounts";
+  const char *accounts_interface_name = "org.freedesktop.Accounts.User";
+  char **object_path;
+  GList *langs = NULL;
+  GList *l = NULL;
+  GString *langs_cache = g_string_new(NULL);
+  GPtrArray *subpaths = g_ptr_array_new ();
+  gboolean use_full_language = FALSE;
+  int i;
+
+  GVariant *ret;
+  ret = g_dbus_proxy_call_sync (G_DBUS_PROXY (proxy),
+                                "ListCachedUsers",
+                                g_variant_new ("()"),
+                                G_DBUS_CALL_FLAGS_NONE,
+                                -1,
+                                NULL,
+                                NULL);
+  if (ret != NULL)
+    {
+      g_variant_get (ret,
+                     "(^ao)",
+                     &object_path);
+      g_variant_unref (ret);
+    }
+
+  if (object_path != NULL)
+    {
+      for (i = 0; object_path[i] != NULL; i++)
+        {
+          GDBusProxy *accounts_proxy = NULL;
+          GVariant *value = NULL;
+          gsize size;
+          char *lang;
+
+          accounts_proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
+                                                          G_DBUS_PROXY_FLAGS_NONE,
+                                                          NULL,
+                                                          accounts_bus_name,
+                                                          object_path[i],
+                                                          accounts_interface_name,
+                                                          NULL,
+                                                          NULL);
+
+          value = g_dbus_proxy_get_cached_property (accounts_proxy, "Language");
+          if (value != NULL)
+            {
+              size = g_variant_get_size (value);
+              lang = g_strdup (g_variant_get_string (value, &size));
+              langs = g_list_append (langs, lang);
+
+              g_variant_unref (value);
+              g_object_unref (accounts_proxy);
+            }
+        }
+  }
+
+  l = langs;
+  while (l != NULL)
+    {
+      g_autofree char *dir = g_strconcat ("/", l->data, NULL);
+      char *c;
+
+      c = strchr (dir, '@');
+      if (c != NULL)
+        *c = 0;
+      c = strchr (dir, '_');
+      if (c != NULL)
+        *c = 0;
+      c = strchr (dir, '.');
+      if (c != NULL)
+        *c = 0;
+
+      if (strcmp (dir, "/C") == 0)
+        continue;
+
+      /* handle language == "" */
+      if (strcmp (dir, "/") == 0)
+        {
+          use_full_language = TRUE;
+          break;
+        }
+
+      /* filter duplicate language */
+      if (g_strrstr (langs_cache->str, dir) == NULL)
+        {
+          g_string_append (langs_cache, dir);
+          g_string_append_c (langs_cache, ':');
+          g_ptr_array_add (subpaths, g_steal_pointer (&dir));
+        }
+
+      l = l->next;
+    }
+
+  if (langs == NULL)
+    {
+      return NULL;
+    }
+
+  l = langs;
+  while (l != NULL)
+    {
+      if (l->data != NULL)
+        g_free (l->data);
+      l = l->next;
+    }
+  g_list_free (langs);
+
+  g_string_free(langs_cache, TRUE);
+
+  g_ptr_array_add (subpaths, NULL);
+
+  if (use_full_language)
+    {
+      g_ptr_array_free (subpaths, TRUE);
+      return NULL;
+    }
+  else
+    return (char **)g_ptr_array_free (subpaths, FALSE);
+}
+
 char **
 flatpak_dir_get_locale_subpaths (FlatpakDir *self)
 {
@@ -9710,7 +9858,22 @@ flatpak_dir_get_locale_subpaths (FlatpakDir *self)
       if (flatpak_dir_is_user (self))
         subpaths = flatpak_get_current_locale_subpaths ();
       else
-        subpaths = g_new0 (char *, 1);
+        {
+          /* If proxy is not NULL, it means that AccountService exists
+           * and gets the list of languages from AccountService. */
+          GDBusProxy *proxy = get_accounts_dbus_proxy ();
+          if (proxy != NULL)
+            {
+              subpaths = get_locale_subpaths_from_accounts_dbus (proxy);
+              g_object_unref (proxy);
+
+              /* If subpaths is NULL, it means using all languages */
+              if (subpaths == NULL)
+                subpaths = g_new0 (char *, 1);
+            }
+          else /* proxy is NULL, falling back to all languages */
+            subpaths = g_new0 (char *, 1);
+        }
     }
 
   return subpaths;