Set Accept-Language header correctly

This makes language autodetection, as implemented by some websites, to
work.

Most of the code stolen from libsoup.
Original patch from Mario Sánchez Prada.
Updated to work with non-English locales.
Approved by Gustavo Noronha.

Bug 602547

1 files changed, 48 insertions, 4 deletions

diff --git a/embed/ephy-embed-prefs.c b/embed/ephy-embed-prefs.c
index 125cddeeb..b39238b08 100644
--- a/embed/ephy-embed-prefs.c
+++ b/embed/ephy-embed-prefs.c
@@ -278,6 +278,49 @@ webkit_pref_callback_font_family (GConfClient *client,
   }
 }
 
+/* Part of this code taken from libsoup (soup-session.c) */
+static gchar *
+build_accept_languages_header (GArray *languages)
+{
+  gchar **langs = NULL;
+  gchar *langs_str = NULL;
+  gint delta;
+  gint i;
+
+  g_return_val_if_fail (languages != NULL, NULL);
+
+  /* Calculate deltas for the quality values */
+  if (languages->len < 10)
+    delta = 10;
+  else if (languages->len < 20)
+    delta = 5;
+  else
+    delta = 1;
+
+  /* Set quality values for each language */
+  langs = (gchar **) languages->data;
+  for (i = 0; langs[i] != NULL; i++) {
+    gchar *lang = (gchar *) langs[i];
+    gint quality = 100 - i * delta;
+
+    if (quality > 0 && quality < 100) {
+      gchar buf[8];
+      g_ascii_formatd (buf, 8, "%.2f", quality/100.0);
+      langs[i] = g_strdup_printf ("%s;q=%s", lang, buf);
+    } else {
+      /* Just dup the string in this case */
+      langs[i] = g_strdup (lang);
+    }
+    g_free (lang);
+  }
+
+  /* Get the result string */
+  if (languages->len > 0)
+    langs_str = g_strjoinv (", ", langs);
+
+  return langs_str;
+}
+
 /* Based on Christian Persch's code from gecko backend of epiphany
    (old transform_accept_languages_list() function) */
 static void
@@ -290,7 +333,7 @@ webkit_pref_callback_accept_languages (GConfClient *client,
   GConfValue *gcvalue;
   GArray *array;
   GSList *languages, *l;
-  char **langs;
+  char **array_data;
   char *langs_str;
   char *webkit_pref;
 
@@ -318,14 +361,15 @@ webkit_pref_callback_accept_languages (GConfClient *client,
 
   ephy_langs_sanitise (array);
 
-  langs = (char **) g_array_free (array, FALSE);
-  langs_str = g_strjoinv (", ", langs);
+  langs_str = build_accept_languages_header (array);
 
   /* Update Soup session */
   session = webkit_get_default_session ();
   g_object_set (G_OBJECT (session), webkit_pref, langs_str, NULL);
 
-  g_strfreev (langs);
+  /* Free memory */
+  array_data = (char **) g_array_free (array, FALSE);
+  g_strfreev (array_data);
   g_free (langs_str);
 }