Generalize redirect route

src/invidious/routes/misc.cr

@@ -38,12 +38,7 @@ class Invidious::Routes::Misc < Invidious::Routes::BaseRoute
 
   def cross_instance_redirect(env)
     instance_url = fetch_random_instance
-    if env.params.query["id"]?
-      id = env.params.query["id"]
-      env.redirect "https://#{instance_url}/watch?v=#{id}"
-    elsif env.params.query["q"]?
-      query, page = env.params.query["q"], env.params.query["page"]
-      env.redirect "https://#{instance_url}/search?q=#{query}&page=#{page}"
-    end
+    referer = get_referer(env)
+    env.redirect "https://#{instance_url}#{referer}"
   end
 end

src/invidious/views/components/item.ecr

@@ -148,7 +148,7 @@
                     <a title="<%=translate(locale, "Audio mode")%>" href="/watch?v=<%= item.id %>&amp;listen=1">
                         <i class="icon ion-md-headset"></i>
                     </a>
-                    <a title="<%=translate(locale, "Switch Invidious Instance")%>" href="/redirect?id=<%= item.id %>&amp;listen=1">
+                    <a title="<%=translate(locale, "Switch Invidious Instance")%>" href="/redirect?referer=<%= env.get?("current_page") %>">
                         <i class="icon ion-md-jet"></i>
                     </a>
                 </div>

src/invidious/views/search.ecr

@@ -5,7 +5,7 @@
 <!-- Search redirection and filtering UI -->
 <% if count == 0 %>
     <h3 style="text-align: center">
-        <%= translate(locale, "Broken?") %> <a href="/redirect?q=<%= HTML.escape(query.not_nil!) %>&page=<%= page + 1 %>"><%= translate(locale, "Switch Invidious Instance") %></a>
+        <%= translate(locale, "Broken?") %> <a href="/redirect?referer=<%= env.get?("current_page") %>"><%= translate(locale, "Switch Invidious Instance") %></a>
     </h3>
 <% else %>
     <details id="filters">

src/invidious/views/watch.ecr

@@ -110,7 +110,7 @@ we're going to need to do it here in order to allow for translations.
                 (<a href="https://www.youtube.com/embed/<%= video.id %>"><%= translate(locale, "Embed") %></a>)
             </span>
             <p id="watch-on-another-invidious-instance">
-                <a href="/redirect?id=<%= video.id %>"><%= translate(locale, "Switch Invidious Instance") %></a>
+                <a href="/redirect?referer=<%= env.get?("current_page") %>"><%= translate(locale, "Switch Invidious Instance") %></a>
             </p>
             <p id="embed-link">
                 <a href="<%= embed_link %>"><%= translate(locale, "Embed Link") %></a>