External Proxies: Use list of external videoplayback proxies

src/invidious.cr

@@ -189,7 +189,7 @@ Invidious::Jobs.register Invidious::Jobs::ClearExpiredItemsJob.new
 
 Invidious::Jobs.register Invidious::Jobs::InstanceListRefreshJob.new
 
-if CONFIG.external_videoplayback_proxy
+if !CONFIG.external_videoplayback_proxy.empty?
   Invidious::Jobs.register Invidious::Jobs::CheckExternalProxy.new
 end
 

src/invidious/config.cr

@@ -180,7 +180,9 @@ class Config
   # of the backend
   property backends_delimiter : String = "|"
 
-  property external_videoplayback_proxy : String?
+  # External videoplayback proxies list. They should include `https://`
+  # at the start of the URI
+  property external_videoplayback_proxy : Array(String) = [] of String
 
   # Materialious redirects
   property materialious_domain : String?

src/invidious/http_server/utils.cr

@@ -4,14 +4,20 @@ module Invidious::HttpServer
   module Utils
     extend self
 
-    @@proxy_alive : Bool = false
+    @@proxy_alive : String = ""
 
     def check_external_proxy
+      CONFIG.external_videoplayback_proxy.each do |proxy|
         begin
-        response = HTTP::Client.get("#{CONFIG.external_videoplayback_proxy}")
-        @@proxy_alive = response.status_code == 200
+          response = HTTP::Client.get(proxy)
+          if response.status_code == 200
+            @@proxy_alive = proxy
+            LOGGER.debug("CheckExternalProxy: Proxy set to: '#{proxy}'")
+            break
+          end
         rescue
-        @@proxy_alive = false
+          LOGGER.debug("CheckExternalProxy: Proxy '#{proxy}' is not available")
+        end
       end
     end
 
@@ -25,8 +31,8 @@ module Invidious::HttpServer
       url.query_params = params
 
       if absolute
-        if @@proxy_alive
-          return "#{CONFIG.external_videoplayback_proxy}#{url.request_target}"
+        if !@@proxy_alive.empty?
+          return "#{@@proxy_alive}#{url.request_target}"
         else
           return "#{HOST_URL}#{url.request_target}"
         end

src/invidious/routes/before_all.cr

@@ -28,12 +28,6 @@ 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:"
@@ -49,7 +43,7 @@ module Invidious::Routes::BeforeAll
       "style-src 'self' 'unsafe-inline'",
       "img-src 'self' data:",
       "font-src 'self' data:",
-      "connect-src 'self'" + external_videoplayback_proxy,
+      "connect-src 'self'" + EXT_VIDEOP_LIST,
       "manifest-src 'self'",
       "media-src 'self' blob:" + extra_media_csp,
       "child-src 'self' blob:",