Make it Crystal <=1.13.3 compatible, only add pot if present

src/invidious/helpers/utils.cr

@@ -1,5 +1,3 @@
-require "uri/params/serializable"
-
 # See http://www.evanmiller.org/how-not-to-sort-by-average-rating.html
 def ci_lower_bound(pos, n)
   if n == 0
@@ -411,15 +409,20 @@ def invidious_companion_encrypt(data)
 end
 
 struct PrivateParams
-  include URI::Params::Serializable
   include JSON::Serializable
 
   property ip : String = ""
-  property pot : String = ""
+  property pot : String? = nil
+
+  def initialize(@ip, @pot)
+  end
 end
 
 def encrypt_query_params(query_params : URI::Params) : String
-  private_params = PrivateParams.from_www_form(query_params.to_s).to_json
+  private_params = PrivateParams.new(
+    query_params["ip"],
+    query_params["pot"]?,
+  ).to_json
   encrypted_data = ecb_without_salt(private_params, CONFIG.hmac_key, :encrypt)
   return Base64.urlsafe_encode(encrypted_data)
 end

src/invidious/http_server/utils.cr

@@ -14,7 +14,7 @@ module Invidious::HttpServer
         params["enc"] = "true"
         params["data"] = encrypted_data
         params.delete("ip")
-        params.delete("pot")
+        params.delete("pot") if params.has_key?("pot")
       end
       params["host"] = url.host.not_nil! # Should never be nil, in theory
       params["region"] = region if !region.nil?

src/invidious/routes/video_playback.cr

@@ -6,8 +6,10 @@ module Invidious::Routes::VideoPlayback
 
     if query_params["enc"]? == "true"
       decrypted_data = decrypt_query_params(query_params["data"])
-      query_params["ip"] = decrypted_data.ip
-      query_params["pot"] = decrypted_data.pot
+      query_params.add("ip", decrypted_data.ip)
+      if pot = decrypted_data.pot
+        query_params.add("pot", pot)
+      end
       query_params.delete("enc")
       query_params.delete("data")
     end