Allow to set maximum custom playlist length via a config variable.

config/config.example.yml

@@ -869,3 +869,11 @@ default_user_preferences:
   ## Default: false
   ##
   #extend_desc: false
+
+  ##
+  ## Maximum custom playlist length limit.
+  ##
+  ## Accepted values: Integer
+  ## Default: 500
+  ##
+  #playlist_length_limit: 500

src/invidious/config.cr

@@ -131,6 +131,9 @@ class Config
   # API URL for Anti-Captcha
   property captcha_api_url : String = "https://api.anti-captcha.com"
 
+  # Playlist length limit
+  property playlist_length_limit : Int32 = 500
+
   def disabled?(option)
     case disabled = CONFIG.disable_proxy
     when Bool

src/invidious/database/playlists.cr

@@ -248,7 +248,7 @@ module Invidious::Database::PlaylistVideos
     return PG_DB.query_one?(request, plid, index, as: String)
   end
 
-  def select_ids(plid : String, index : VideoIndex, limit = 500) : Array(String)
+  def select_ids(plid : String, index : VideoIndex, limit = CONFIG.playlist_length_limit) : Array(String)
     request = <<-SQL
       SELECT id FROM playlist_videos
       WHERE plid = $1

src/invidious/routes/api/v1/authenticated.cr

@@ -226,8 +226,8 @@ module Invidious::Routes::API::V1::Authenticated
       return error_json(403, "Invalid user")
     end
 
-    if playlist.index.size >= 500
-      return error_json(400, "Playlist cannot have more than 500 videos")
+    if playlist.index.size >= CONFIG.playlist_length_limit
+      return error_json(400, "Playlist cannot have more than #{CONFIG.playlist_length_limit} videos")
     end
 
     video_id = env.params.json["videoId"].try &.as(String)

src/invidious/routes/playlists.cr

@@ -330,11 +330,11 @@ module Invidious::Routes::Playlists
     when "action_edit_playlist"
       # TODO: Playlist stub
     when "action_add_video"
-      if playlist.index.size >= 500
+      if playlist.index.size >= CONFIG.playlist_length_limit
         if redirect
-          return error_template(400, "Playlist cannot have more than 500 videos")
+          return error_template(400, "Playlist cannot have more than #{CONFIG.playlist_length_limit} videos")
         else
-          return error_json(400, "Playlist cannot have more than 500 videos")
+          return error_json(400, "Playlist cannot have more than #{CONFIG.playlist_length_limit} videos")
         end
       end
 

src/invidious/routes/subscriptions.cr

@@ -120,7 +120,7 @@ module Invidious::Routes::Subscriptions
                     json.field "privacy", playlist.privacy.to_s
                     json.field "videos" do
                       json.array do
-                        Invidious::Database::PlaylistVideos.select_ids(playlist.id, playlist.index, limit: 500).each do |video_id|
+                        Invidious::Database::PlaylistVideos.select_ids(playlist.id, playlist.index, limit: CONFIG.playlist_length_limit).each do |video_id|
                           json.string video_id
                         end
                       end

src/invidious/user/imports.cr

@@ -71,7 +71,7 @@ struct Invidious::User
           Invidious::Database::Playlists.update_description(playlist.id, description)
 
           videos = item["videos"]?.try &.as_a?.try &.each_with_index do |video_id, idx|
-            raise InfoException.new("Playlist cannot have more than 500 videos") if idx > 500
+            raise InfoException.new("Playlist cannot have more than #{CONFIG.playlist_length_limit} videos") if idx > 500
 
             video_id = video_id.try &.as_s?
             next if !video_id