fixup! Feat: Experimental support for external videoplayback proxies

src/invidious/jobs/check_external_proxy.cr

@@ -0,0 +1,13 @@
+class Invidious::Jobs::CheckExternalProxy < Invidious::Jobs::BaseJob
+  def initialize
+  end
+
+  def begin
+    loop do
+      Invidious::Routes::API::Manifest.check_external_proxy
+      LOGGER.info("CheckExternalProxy: Done, sleeping for 1 minute")
+      sleep 1.minutes
+      Fiber.yield
+    end
+  end
+end

src/invidious/routes/api/manifest.cr

@@ -1,4 +1,15 @@
 module Invidious::Routes::API::Manifest
+  @@proxy_alive : Bool = false
+
+  def self.check_external_proxy
+    begin
+      response = HTTP::Client.get("#{CONFIG.external_videoplayback_proxy}")
+      @@proxy_alive = response.status_code == 200
+    rescue
+      @@proxy_alive = false
+    end
+  end
+
   # /api/manifest/dash/id/:id
   def self.get_dash_video_id(env)
     env.response.headers.add("Access-Control-Allow-Origin", "*")
@@ -35,7 +46,7 @@ module Invidious::Routes::API::Manifest
 
         if local
           uri = URI.parse(url)
-          if CONFIG.external_videoplayback_proxy
+          if @@proxy_alive
             url = "#{CONFIG.external_videoplayback_proxy}#{uri.request_target}host/#{uri.host}/"
           else
             url = "#{HOST_URL}#{uri.request_target}host/#{uri.host}/"
@@ -52,7 +63,7 @@ module Invidious::Routes::API::Manifest
 
     if local
       adaptive_fmts.each do |fmt|
-        if CONFIG.external_videoplayback_proxy
+        if @@proxy_alive
           fmt["url"] = JSON::Any.new("#{CONFIG.external_videoplayback_proxy}#{URI.parse(fmt["url"].as_s).request_target}")
         else
           fmt["url"] = JSON::Any.new("#{HOST_URL}#{URI.parse(fmt["url"].as_s).request_target}")