Routes: use 'resolve_url()' in 404 error route

src/invidious/routes/errors.cr

@@ -5,48 +5,28 @@ module Invidious::Routes::ErrorRoutes
       return env.redirect "#{env.request.path[15..]}?#{env.params.query}"
     end
 
-    if md = env.request.path.match(/^\/(?<id>([a-zA-Z0-9_-]{11})|(\w+))$/)
-      item = md["id"]
-
+    if match = env.request.path.match(/^\/(?<id>[a-zA-Z0-9_-]{11})$/)
+      # NOTE: we assume that a 11 chars long path is a video ID
+      # to spare a call to 'resolve_url' and improve response time.
+      id = match["id"]
+      url = HttpServer::Utils.add_params_to_url("/watch?v=#{id}", env.params.query)
+      return env.redirect url.to_s
+      #
+    elsif match = env.request.path.match(/^\/(?<name>\w+)$/)
       # Check if item is branding URL e.g. https://youtube.com/gaming
-      response = YT_POOL.client &.get("/#{item}")
+      begin
+        response = YoutubeAPI.resolve_url("https://youtube.com/#{env.request.path}")
+        endpoint = response["endpoint"]
 
-      if response.status_code == 301
-        response = YT_POOL.client &.get(URI.parse(response.headers["Location"]).request_target)
-      end
-
-      if response.body.empty?
-        env.response.headers["Location"] = "/"
-        haltf env, status_code: 302
-      end
-
-      html = XML.parse_html(response.body)
-      ucid = html.xpath_node(%q(//link[@rel="canonical"])).try &.["href"].split("/")[-1]
-
-      if ucid
-        env.response.headers["Location"] = "/channel/#{ucid}"
-        haltf env, status_code: 302
-      end
-
-      params = [] of String
-      env.params.query.each do |k, v|
-        params << "#{k}=#{v}"
-      end
-      params = params.join("&")
-
-      url = "/watch?v=#{item}"
-      if !params.empty?
-        url += "&#{params}"
-      end
-
-      # Check if item is video ID
-      if item.match(/^[a-zA-Z0-9_-]{11}$/) && YT_POOL.client &.head("/watch?v=#{item}").status_code != 404
-        env.response.headers["Location"] = url
-        haltf env, status_code: 302
+        if ucid = endpoint.dig?("browseEndpoint", "browseId")
+          url = HttpServer::Utils.add_params_to_url("/channel/#{ucid}", env.params.query)
+          return env.redirect url.to_s
+        end
+      rescue ex
       end
     end
 
-    env.response.headers["Location"] = "/"
-    haltf env, status_code: 302
+    # TODO: create a proper 404 page
+    haltf env, status_code: 404
   end
 end