feat: Detect videoplayback proxy from invidious-companion and add it to the CSP header

src/invidious.cr

@@ -223,6 +223,10 @@ else
   LOGGER.info("jobs: Disabling RefreshSessionTokens job. Invidious will use the tokens that are on the configuration file")
 end
 
+if CONFIG.invidious_companion.present?
+  Invidious::Jobs.register Invidious::Jobs::CheckBackend.new
+end
+
 Invidious::Jobs.start_all
 
 def popular_videos

src/invidious/helpers/backend_info.cr

@@ -0,0 +1,17 @@
+module BackendInfo
+  extend self
+  @@exvpp_url : String = ""
+
+  def get_videoplayback_proxy
+    begin
+      response = HTTP::Client.get "#{CONFIG.invidious_companion.sample.private_url}/info"
+      exvpp_url = JSON.parse(response.body)["external_videoplayback_proxy"].to_s
+      @@exvpp_url = exvpp_url
+    rescue
+    end
+  end
+
+  def get_exvpp
+    return @@exvpp_url
+  end
+end

src/invidious/jobs/cbackend_checker.cr

@@ -0,0 +1,14 @@
+class Invidious::Jobs::CheckBackend < Invidious::Jobs::BaseJob
+  def initialize
+  end
+
+  def begin
+    loop do
+      # BackendInfo.check_backends
+      BackendInfo.get_videoplayback_proxy
+      LOGGER.info("Backend Checker: Done, sleeping for 60 seconds")
+      sleep 60.seconds
+      Fiber.yield
+    end
+  end
+end

src/invidious/routes/before_all.cr

@@ -26,6 +26,11 @@ module Invidious::Routes::BeforeAll
     if CONFIG.invidious_companion.present?
       extra_media_csp = " #{CONFIG.invidious_companion.sample.public_url}"
       extra_connect_csp = " #{CONFIG.invidious_companion.sample.public_url}"
+      exvpp_url = BackendInfo.get_exvpp
+      if !exvpp_url.empty?
+        extra_media_csp += " #{exvpp_url}"
+        extra_connect_csp += " #{exvpp_url}"
+      end
     end
 
     if !CONFIG.external_videoplayback_proxy.empty?