feat: add confirm leaving Invidious view and route

src/invidious/routes/misc.cr

@@ -43,4 +43,14 @@ module Invidious::Routes::Misc
     instance_url = fetch_random_instance
     env.redirect "https://#{instance_url}#{referer}"
   end
+
+  def self.confirm_leave(env)
+    locale = env.get("preferences").as(Preferences).locale
+    
+    link = env.params.query["link"]?
+
+    referer = get_referer(env)
+
+    templated "confirm_leave"
+  end
 end

src/invidious/routing.cr

@@ -21,6 +21,7 @@ module Invidious::Routing
       get "/privacy", Routes::Misc, :privacy
       get "/licenses", Routes::Misc, :licenses
       get "/redirect", Routes::Misc, :cross_instance_redirect
+      get "/confirm_leave", Routes::Misc, :confirm_leave
 
       self.register_channel_routes
       self.register_watch_routes

src/invidious/views/confirm_leave.ecr

@@ -0,0 +1,24 @@
+<% content_for "header" do %>
+<title><%= translate(locale, "Leave Invidious") %> - Invidious</title>
+<% end %>
+
+<div class="h-box">
+    <div class="pure-form pure-form-aligned">
+
+        <legend><%= translate(locale, "You are leaving Invidious. Continue to external link?") %></legend>
+
+        <div class="pure-g">
+            <div class="pure-u-1-2">
+                <a value="confirm_leave" class="pure-button pure-button-primary" href="<%= link %>">
+                    <%= translate(locale, "Yes") %>
+                </a>
+            </div>
+            <div class="pure-u-1-2">
+                <a class="pure-button" href="<%= referer %>">
+                    <%= translate(locale, "No") %>
+                </a>
+            </div>
+        </div>
+
+    </div>
+</div>