Add 'host' to '/videoplayback'

src/invidious.cr

@@ -4217,9 +4217,15 @@ end
 get "/videoplayback" do |env|
   query_params = env.params.query
 
+  if query_params["host"]? && !query_params["host"].empty?
+    pp query_params["host"]
+    host = "https://#{query_params["host"]}"
+  else
     fvip = query_params["fvip"]? || "3"
     mn = query_params["mn"].split(",").pop
     host = "https://r#{fvip}---#{mn}.googlevideo.com"
+  end
+
   url = "/videoplayback?#{query_params.to_s}"
 
   headers = HTTP::Headers.new

src/invidious/videos.cr

@@ -317,6 +317,7 @@ class Video
     end
 
     streams.each do |fmt|
+      fmt["url"] += "&host=" + (URI.parse(fmt["url"]).host || "")
       fmt["url"] += decrypt_signature(fmt, decrypt_function)
     end
 
@@ -384,6 +385,7 @@ class Video
     end
 
     adaptive_fmts.each do |fmt|
+      fmt["url"] += "&host=" + (URI.parse(fmt["url"]).host || "")
       fmt["url"] += decrypt_signature(fmt, decrypt_function)
     end