Feat: Experimental support for external videoplayback proxies

src/invidious.cr

@@ -188,6 +188,10 @@ Invidious::Jobs.register Invidious::Jobs::ClearExpiredItemsJob.new
 
 Invidious::Jobs.register Invidious::Jobs::InstanceListRefreshJob.new
 
+if CONFIG.external_videoplayback_proxy
+  Invidious::Jobs.register Invidious::Jobs::CheckExternalProxy.new
+end
+
 Invidious::Jobs.start_all
 
 def popular_videos

src/invidious/config.cr

@@ -172,6 +172,8 @@ class Config
   # List of names of the backends
   property backends : Array(String) = [] of String
 
+  property external_videoplayback_proxy : String?
+
   # Materialious redirects
   property materialious_domain : String?
 

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", "*")
@@ -35,8 +46,12 @@ module Invidious::Routes::API::Manifest
 
         if local
           uri = URI.parse(url)
+          if @@proxy_alive
+            url = "#{CONFIG.external_videoplayback_proxy}#{uri.request_target}host/#{uri.host}/"
+          else
             url = "#{HOST_URL}#{uri.request_target}host/#{uri.host}/"
           end
+        end
 
         "<BaseURL>#{url}</BaseURL>"
       end
@@ -48,9 +63,13 @@ module Invidious::Routes::API::Manifest
 
     if local
       adaptive_fmts.each do |fmt|
+        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}")
         end
       end
+    end
 
     audio_streams = video.audio_streams.sort_by { |stream| {stream["bitrate"].as_i} }.reverse!
     video_streams = video.video_streams.sort_by { |stream| {stream["width"].as_i, stream["fps"].as_i} }.reverse!
@@ -62,7 +81,6 @@ module Invidious::Routes::API::Manifest
       end
     end
 
-
     manifest = XML.build(indent: "  ", encoding: "UTF-8") do |xml|
       xml.element("MPD", "xmlns": "urn:mpeg:dash:schema:mpd:2011",
         "profiles": "urn:mpeg:dash:profile:full:2011", minBufferTime: "PT1.5S", type: "static",

src/invidious/routes/before_all.cr

@@ -28,6 +28,12 @@ module Invidious::Routes::BeforeAll
       extra_media_csp = ""
     end
 
+    if CONFIG.external_videoplayback_proxy
+      external_videoplayback_proxy = " #{CONFIG.external_videoplayback_proxy}"
+    else
+      external_videoplayback_proxy = ""
+    end
+
     # Only allow the pages at /embed/* to be embedded
     if env.request.resource.starts_with?("/embed")
       frame_ancestors = "'self' file: http: https:"
@@ -43,7 +49,7 @@ module Invidious::Routes::BeforeAll
       "style-src 'self' 'unsafe-inline'",
       "img-src 'self' data:",
       "font-src 'self' data:",
-      "connect-src 'self'",
+      "connect-src 'self'" + external_videoplayback_proxy,
       "manifest-src 'self'",
       "media-src 'self' blob:" + extra_media_csp,
       "child-src 'self' blob:",