Add support for an external signature server (#4772)

This PR adds support for inv_sig_helper, which offloads the player fetching,
function extraction and signature parsing, which in turn allows to use the
web client to watch videos.

When the new config option "signature_server" is not set, the logic for the
external signature server is not enabled and invidious behaves like before.

This PR also updates the crystal overrides because the stdlib changed quite
a while ago (See issue 11049 at crystal-lang/crystal) and those were required
to properly use TCP/unix sockets.

Closes issue 4649

1 files changed, 9 insertions, 5 deletions

diff --git a/src/invidious.cr b/src/invidious.cr
index e0bd0101..3804197e 100644
--- a/src/invidious.cr
+++ b/src/invidious.cr
@@ -153,6 +153,15 @@ Invidious::Database.check_integrity(CONFIG)
   {% puts "\nDone checking player dependencies, now compiling Invidious...\n" %}
 {% end %}
 
+# Misc
+
+DECRYPT_FUNCTION =
+  if sig_helper_address = CONFIG.signature_server.presence
+    IV::DecryptFunction.new(sig_helper_address)
+  else
+    nil
+  end
+
 # Start jobs
 
 if CONFIG.channel_threads > 0
@@ -163,11 +172,6 @@ if CONFIG.feed_threads > 0
   Invidious::Jobs.register Invidious::Jobs::RefreshFeedsJob.new(PG_DB)
 end
 
-DECRYPT_FUNCTION = DecryptFunction.new(CONFIG.decrypt_polling)
-if CONFIG.decrypt_polling
-  Invidious::Jobs.register Invidious::Jobs::UpdateDecryptFunctionJob.new
-end
-
 if CONFIG.statistics_enabled
   Invidious::Jobs.register Invidious::Jobs::StatisticsRefreshJob.new(PG_DB, SOFTWARE)
 end