From 2af6974ec49b0cff9b662d1688d8332c0d995189 Mon Sep 17 00:00:00 2001
From: Veloman Yunkan <veloman.yunkan@gmail.com>
Date: Thu, 19 Jan 2023 19:02:55 +0400
Subject: [PATCH] UI language setting is preserved in a cookie

---
 static/skin/i18n.js | 14 ++++++++++++++
 test/server.cpp     |  4 ++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/static/skin/i18n.js b/static/skin/i18n.js
index a5ce72d2b..72d7d3b20 100644
--- a/static/skin/i18n.js
+++ b/static/skin/i18n.js
@@ -69,6 +69,17 @@ function $t(msgId, params={}) {
   }
 }
 
+function getCookie(cookieName) {
+    const name = cookieName + "=";
+    let result;
+    decodeURIComponent(document.cookie).split('; ').forEach(val => {
+        if (val.indexOf(name) === 0) {
+            result = val.substring(name.length);
+        }
+    });
+    return result;
+}
+
 
 const DEFAULT_UI_LANGUAGE = 'en';
 
@@ -76,10 +87,13 @@ Translations.load(DEFAULT_UI_LANGUAGE, /*asDefault=*/true);
 
 function getUserLanguage() {
   return new URLSearchParams(window.location.search).get('userlang')
+      || getCookie('userlang')
       || DEFAULT_UI_LANGUAGE;
 }
 
 function setUserLanguage(lang, callback) {
+  const rootPath = new URL('..', import.meta.url).pathname.replace(/\/$/, '');
+  document.cookie = `userlang=${lang};path=${rootPath};max-age=31536000`;
   Translations.load(lang);
   Translations.whenReady(callback);
 }
diff --git a/test/server.cpp b/test/server.cpp
index 00160d2ad..d208e5f9a 100644
--- a/test/server.cpp
+++ b/test/server.cpp
@@ -59,7 +59,7 @@ const ResourceCollection resources200Compressible{
   { DYNAMIC_CONTENT, "/ROOT/skin/favicon/favicon.ico" },
   { STATIC_CONTENT,  "/ROOT/skin/favicon/favicon.ico?cacheid=fba03a27" },
   { DYNAMIC_CONTENT, "/ROOT/skin/i18n.js" },
-  { STATIC_CONTENT,  "/ROOT/skin/i18n.js?cacheid=eb41f5ce" },
+  { STATIC_CONTENT,  "/ROOT/skin/i18n.js?cacheid=dcf3d584" },
   { DYNAMIC_CONTENT, "/ROOT/skin/index.css" },
   { STATIC_CONTENT,  "/ROOT/skin/index.css?cacheid=0f9ba34e" },
   { DYNAMIC_CONTENT, "/ROOT/skin/index.js" },
@@ -300,7 +300,7 @@ R"EXPECTEDRESULT(                                <img src="../skin/download.png?
       /* url */ "/ROOT/viewer",
 R"EXPECTEDRESULT(    <link type="text/css" href="./skin/taskbar.css?cacheid=2cbac34b" rel="Stylesheet" />
     <link type="text/css" href="./skin/css/autoComplete.css?cacheid=08951e06" rel="Stylesheet" />
-    <script type="module" src="./skin/i18n.js?cacheid=eb41f5ce" defer></script>
+    <script type="module" src="./skin/i18n.js?cacheid=dcf3d584" defer></script>
     <script type="text/javascript" src="./skin/languages.js?cacheid=fe100348" defer></script>
     <script type="text/javascript" src="./skin/viewer.js?cacheid=b3c754ec" defer></script>
     <script type="text/javascript" src="./skin/autoComplete.min.js?cacheid=1191aaaf"></script>