From caa2273bf2d94a0fc098199c269d88778a177bc5 Mon Sep 17 00:00:00 2001
From: Fijxu <fijxu@nadeko.net>
Date: Thu, 8 May 2025 20:22:29 -0400
Subject: [PATCH] fix(backend switcher): pass referer in URL

Closes https://git.nadeko.net/Fijxu/invidious/issues/109

This will allow browsers that by default set the referer to the same
page to tracking via the referer header. IceCat browser does this.
---
 src/invidious/routes/backend_switcher.cr | 2 +-
 src/invidious/views/template.ecr         | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/invidious/routes/backend_switcher.cr b/src/invidious/routes/backend_switcher.cr
index ad7d7e3d..e4702729 100644
--- a/src/invidious/routes/backend_switcher.cr
+++ b/src/invidious/routes/backend_switcher.cr
@@ -2,7 +2,7 @@
 
 module Invidious::Routes::BackendSwitcher
   def self.switch(env)
-    referer = get_referer(env)
+    referer = get_referer(env, unroll: false)
     backend_id = env.params.query["backend_id"]?.try &.to_i
 
     if backend_id.nil?
diff --git a/src/invidious/views/template.ecr b/src/invidious/views/template.ecr
index cb08968c..2665b381 100644
--- a/src/invidious/views/template.ecr
+++ b/src/invidious/views/template.ecr
@@ -133,8 +133,9 @@
 							<% end %>
 						<% end %>
 					<% else %>
+						<% current_page = env.get("current_page") %>
 						<% CONFIG.invidious_companion.each_with_index do | companion, index | %>
-							<a href="/switchbackend?backend_id=<%= index.to_s %>" style="<%= current_backend == index ? "text-decoration-line: underline;" : "" %> display: inline-block;">
+							<a href="/switchbackend?backend_id=<%= index.to_s %>&referer=<%= current_page %>" style="<%= current_backend == index ? "text-decoration-line: underline;" : "" %> display: inline-block;">
 								Backend<%= HTML.escape((index + 1).to_s) %> <%= HTML.escape(companion.note) %>
 								<span style="color:
 									<% if status[index] == 0 %> #fd4848; <% end %>