From e3a211e41c83abdd3c31ec35dfdcad6ea43a31ff Mon Sep 17 00:00:00 2001
From: Nikhil Tanwar <2002nikhiltanwar@gmail.com>
Date: Sun, 5 Feb 2023 17:27:49 +0530
Subject: [PATCH] Add RSS Feed extension in head

This change adds a <link> element in the head node of welcome page.
Browsers with extensions for RSS will show a sign to navigate to the feed.
The link changes based on current set filters.
---
 static/skin/index.js        | 13 +++++++++++++
 static/templates/index.html |  7 +++++++
 test/server.cpp             |  4 ++--
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/static/skin/index.js b/static/skin/index.js
index 7f29b316e..ec54a098a 100644
--- a/static/skin/index.js
+++ b/static/skin/index.js
@@ -18,6 +18,17 @@
     let timer;
     let languages = {};
 
+    function updateFeedLink() {
+        const inputParams = new URLSearchParams(window.location.search);
+        const filteredParams = new URLSearchParams();
+        for (const [key, value] of inputParams) {
+            if ( value != '' ) {
+                filteredParams.append(key, value);
+            }
+        }
+        document.querySelector('#feed_link').href = `${root}/catalog/v2/entries?${filteredParams.toString()}`;
+    }
+
     function queryUrlBuilder() {
         let url = `${root}/catalog/search?`;
         url += Object.keys(incrementalLoadingParams).map(key => `${key}=${incrementalLoadingParams[key]}`).join("&");
@@ -363,6 +374,7 @@
             setCookie(filterCookieName, params.toString());
         }
         updateFilterColors();
+        updateFeedLink();
         await loadAndDisplayBooks(true);
     }
 
@@ -492,6 +504,7 @@
                 langFilter.dispatchEvent(new Event('change'));
             }
         }
+        updateFeedLink();
         setCookie(filterCookieName, params.toString());
     }
 })();
diff --git a/static/templates/index.html b/static/templates/index.html
index 2bd067a23..652bc69fb 100644
--- a/static/templates/index.html
+++ b/static/templates/index.html
@@ -10,6 +10,13 @@
       href="{{root}}/skin/index.css?KIWIXCACHEID"
       rel="Stylesheet"
     />
+    <link 
+      rel="alternate" 
+      type="application/atom+xml" 
+      title="Library OPDS Feed"
+      id="feed_link" 
+      href="{{root}}/catalog/v2/entries"
+    />
     <link rel="apple-touch-icon" sizes="180x180" href="{{root}}/skin/favicon/apple-touch-icon.png?KIWIXCACHEID">
     <link rel="icon" type="image/png" sizes="32x32" href="{{root}}/skin/favicon/favicon-32x32.png?KIWIXCACHEID">
     <link rel="icon" type="image/png" sizes="16x16" href="{{root}}/skin/favicon/favicon-16x16.png?KIWIXCACHEID">
diff --git a/test/server.cpp b/test/server.cpp
index c99e960e9..6a660fe3a 100644
--- a/test/server.cpp
+++ b/test/server.cpp
@@ -63,7 +63,7 @@ const ResourceCollection resources200Compressible{
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/index.css" },
   { STATIC_CONTENT,  "/ROOT%23%3F/skin/index.css?cacheid=0f9ba34e" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/index.js" },
-  { STATIC_CONTENT,  "/ROOT%23%3F/skin/index.js?cacheid=2f5a81ac" },
+  { STATIC_CONTENT,  "/ROOT%23%3F/skin/index.js?cacheid=3f19d670" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/iso6391To3.js" },
   { STATIC_CONTENT,  "/ROOT%23%3F/skin/iso6391To3.js?cacheid=ecde2bb3" },
   { DYNAMIC_CONTENT, "/ROOT%23%3F/skin/isotope.pkgd.min.js" },
@@ -280,7 +280,7 @@ R"EXPECTEDRESULT(      href="/ROOT%23%3F/skin/index.css?cacheid=0f9ba34e"
           src: url("/ROOT%23%3F/skin/fonts/Roboto.ttf?cacheid=84d10248") format("truetype");
     <script src="/ROOT%23%3F/skin/isotope.pkgd.min.js?cacheid=2e48d392" defer></script>
     <script src="/ROOT%23%3F/skin/iso6391To3.js?cacheid=ecde2bb3"></script>
-    <script type="text/javascript" src="/ROOT%23%3F/skin/index.js?cacheid=2f5a81ac" defer></script>
+    <script type="text/javascript" src="/ROOT%23%3F/skin/index.js?cacheid=3f19d670" defer></script>
 )EXPECTEDRESULT"
     },
     {