PubSub: Use external domain for pubsub feeds

src/invidious/config.cr

@@ -187,6 +187,8 @@ class Config
   # Job to refresh tokens from a Redis compatible DB
   property refresh_tokens : Bool = true
 
+  property pubsub_domain : String = ""
+
   # Materialious redirects
   property materialious_domain : String?
 

src/invidious/helpers/utils.cr

@@ -294,7 +294,7 @@ def subscribe_pubsub(topic, key)
   signature = "#{time}:#{nonce}"
 
   body = {
-    "hub.callback"      => "#{HOST_URL}/feed/webhook/v1:#{time}:#{nonce}:#{OpenSSL::HMAC.hexdigest(:sha1, key, signature)}",
+    "hub.callback"      => "#{PUBSUB_HOST_URL}/feed/webhook/v1:#{time}:#{nonce}:#{OpenSSL::HMAC.hexdigest(:sha1, key, signature)}",
     "hub.topic"         => "https://www.youtube.com/xml/feeds/videos.xml?#{topic}",
     "hub.verify"        => "async",
     "hub.mode"          => "subscribe",

src/invidious/jobs/subscribe_to_feeds_job.cr

@@ -30,6 +30,8 @@ class Invidious::Jobs::SubscribeToFeedsJob < Invidious::Jobs::BaseJob
           spawn do
             begin
               response = subscribe_pubsub(ucid, hmac_key)
+			  LOGGER.debug("SubscribeToFeedsJob: Subscribed to #{ucid}.")
+			  LOGGER.trace("SubscribeToFeedsJob: response.body: #{response.body}")
 
               if response.status_code >= 400
                 LOGGER.error("SubscribeToFeedsJob: #{ucid} : #{response.body}")