From b178df89b03266609147e3a8d6107d99c6482797 Mon Sep 17 00:00:00 2001
From: Las Zenow <zenow@riseup.net>
Date: Mon, 27 Apr 2015 20:54:41 -0400
Subject: [PATCH] Check if the lang is supported by mongo

If an unsoported lang is setted in the language override the document
will fail on inserting in the database, causing it to be lost.
---
 database/books.go | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/database/books.go b/database/books.go
index f2c3125..77624ad 100644
--- a/database/books.go
+++ b/database/books.go
@@ -151,9 +151,7 @@ func updateBook(coll *mgo.Collection, id string, data map[string]interface{}) er
 	for k, _ := range data {
 		record.Changes[k] = book[k]
 		if k == "lang" {
-			if lang := metadataLang(data); lang != "" {
-				data["_lang"] = lang
-			}
+			data["_lang"] = metadataLang(data)
 		}
 	}
 
@@ -220,9 +218,18 @@ func buildQuery(q string) bson.M {
 }
 
 func metadataLang(book map[string]interface{}) string {
+	text_search_langs := map[string]bool{
+		"da": true, "nl": true, "en": true, "fi": true, "fr": true, "de": true,
+		"hu": true, "it": true, "nb": true, "pt": true, "ro": true, "ru": true,
+		"es": true, "sv": true, "tr": true}
+
 	lang, ok := book["lang"].([]string)
 	if !ok || len(lang) == 0 || len(lang[0]) < 2 {
-		return ""
+		return "none"
 	}
-	return strings.ToLower(lang[0][0:2])
+	lcode := strings.ToLower(lang[0][0:2])
+	if text_search_langs[lcode] {
+		return lcode
+	}
+	return "none"
 }