feat: add support for additional channel urls (:user/:tab)

src/invidious/routes/channels.cr

@@ -335,6 +335,18 @@ module Invidious::Routes::Channels
     "posts",
   }
 
+  def self.potential_brand_redirect(env)
+    # Check for known tab in url before trying to brand_redirect (avoids unneeded request to YouTube)
+
+    selected_tab = env.params.url["tab"]?
+
+    if KNOWN_TABS.includes? selected_tab
+      brand_redirect(env)
+    else
+      Invidious::Routes::Misc.home(env)
+    end
+  end
+
   # Redirects brand url channels to a normal /channel/:ucid route
   def self.brand_redirect(env)
     locale = env.get("preferences").as(Preferences).locale

src/invidious/routing.cr

@@ -47,6 +47,8 @@ module Invidious::Routing
     self.register_api_manifest_routes
     self.register_video_playback_routes
     self.register_companion_routes
+
+    get "/:user/:tab", Routes::Channels, :potential_brand_redirect
   end
 
   # -------------------