.env.example

@@ -17,6 +17,7 @@ SERVER_REDIRECT_URI=http://127.0.0.1:3000/api/oauth/redirect
 DISCORD_CLIENT_ID=
 DISCORD_CLIENT_SECRET=
 DISCORD_USER_AGENT=
+DISCORD_BOT_TOKEN=
 
 JWT_SECRET=aVerySecretJwtSigningSecret
 
@@ -29,4 +30,4 @@ REDIS_PORT=6379
 
 NEW_GAME_PINGABLE_ROLE_ID=1123232
 NEW_GAME_CHANNEL_WEBHOOK=https://discordapp.com/api/webhooks/
-REMIND_MOVE_CHANNEL_WEBHOOK=https://discordapp.com/api/webhooks/
+REMIND_MOVE_CHANNEL_ID=

config/config.exs

@@ -15,7 +15,7 @@ config :chessh, RateLimits,
   player_public_keys: 15,
   create_game_ms: 60 * 1000,
   create_game_rate: 3,
-  discord_notification_rate: 3,
+  discord_notification_rate: 30,
   discord_notification_rate_ms: 1000
 
 config :chessh, Web,

config/runtime.exs

@@ -5,8 +5,9 @@ config :chessh,
 
 config :chessh, DiscordNotifications,
   looking_for_games_role_mention: "<@&#{System.get_env("NEW_GAME_PINGABLE_ROLE_ID")}>",
-  discord_game_move_notif_webhook: System.get_env("REMIND_MOVE_CHANNEL_WEBHOOK"),
+  remind_move_channel_id: System.get_env("REMIND_MOVE_CHANNEL_ID"),
-  discord_new_game_notif_webhook: System.get_env("NEW_GAME_CHANNEL_WEBHOOK")
+  discord_bot_token: System.get_env("DISCORD_BOT_TOKEN"),
+  new_game_channel_id: System.get_env("NEW_GAME_CHANNEL_ID")
 
 config :chessh, Web,
   discord_client_id: System.get_env("DISCORD_CLIENT_ID"),

lib/chessh/discord/notifier.ex

@@ -50,9 +50,9 @@ defmodule Chessh.DiscordNotifier do
   end
 
   defp send_notification({:move_reminder, game_id}) do
-    [min_delta_t, discord_game_move_notif_webhook] =
+    [min_delta_t, remind_move_channel_id] =
       Application.get_env(:chessh, DiscordNotifications)
-      |> Keyword.take([:game_move_notif_delay_ms, :discord_game_move_notif_webhook])
+      |> Keyword.take([:game_move_notif_delay_ms, :remind_move_channel_id])
       |> Keyword.values()
 
     case Repo.get(Game, game_id) |> Repo.preload([:dark_player, :light_player]) do
@@ -62,13 +62,22 @@ defmodule Chessh.DiscordNotifier do
         turn: turn,
         updated_at: last_updated,
         moves: move_count,
-        status: :continue
+        status: :continue,
-      } ->
+        discord_thread_id: discord_thread_id
+      } = game ->
+        if is_nil(discord_thread_id) do
+          {:ok, game} =
+            Game.changeset(game, %{
+              discord_thread_id: make_private_discord_thread_id(remind_move_channel_id, game)
+            })
+            |> Repo.update()
+        end
+
         delta_t = NaiveDateTime.diff(NaiveDateTime.utc_now(), last_updated, :millisecond)
 
         if delta_t >= min_delta_t do
           post_discord(
-            discord_game_move_notif_webhook,
+            game.discord_thread_id,
             "<@#{if turn == :light, do: light_player_discord_id, else: dark_player_discord_id}> it is your move in Game #{game_id} (move #{move_count})."
           )
         end
@@ -79,9 +88,9 @@ defmodule Chessh.DiscordNotifier do
   end
 
   defp send_notification({:game_created, game_id}) do
-    [pingable_mention, discord_game_created_notif_webhook] =
+    [pingable_mention, new_game_channel_id] =
       Application.get_env(:chessh, DiscordNotifications)
-      |> Keyword.take([:looking_for_games_role_mention, :discord_new_game_notif_webhook])
+      |> Keyword.take([:looking_for_games_role_mention, :new_game_channel_id])
       |> Keyword.values()
 
     case Repo.get(Game, game_id) do
@@ -107,16 +116,16 @@ defmodule Chessh.DiscordNotifier do
           end
 
         if message do
-          post_discord(discord_game_created_notif_webhook, message)
+          post_discord(new_game_channel_id, message)
         end
     end
   end
 
-  defp post_discord(webhook, message) do
+  defp post_discord(channel_id, message) do
     :httpc.request(
       :post,
       {
-        String.to_charlist(webhook),
+        'https://discord.com/api/channels/#{channel_id}/messages',
         [],
         'application/json',
         %{content: message} |> Jason.encode!() |> String.to_charlist()
@@ -125,4 +134,48 @@ defmodule Chessh.DiscordNotifier do
       []
     )
   end
+
+  defp make_private_discord_thread_id(channel_id, %Game{
+         dark_player: %Player{discord_id: dark_player_discord_id},
+         light_player: %Player{discord_id: light_player_discord_id}
+       }) do
+    %{"id" => thread_id} =
+      :httpc.request(
+        :post,
+        {
+          'https://discord.com/api/channels/#{channel_id}/threads',
+          [
+            make_authorization_header()
+          ],
+          'application/json',
+          %{
+            # Private thread
+            type: 12
+          }
+          |> Jason.encode!()
+          |> String.to_charlist()
+        },
+        [],
+        []
+      )
+      |> Jason.decode!()
+
+    [light_player_discord_id, dark_player_discord_id]
+    |> Enum.map(fn id ->
+      :httpc.request(
+        :post,
+        {
+          'https://discord.com/api/channels/#{thread_id}/thread-members/#{id}',
+          []
+        }
+      )
+    end)
+
+    thread_id
+  end
+
+  defp make_authorization_header() do
+    bot_token = Application.get_env(:chessh, DiscordNotifications)[:discord_bot_token]
+    {'Authorization', 'Bot #{bot_token}'}
+  end
 end

lib/chessh/schema/game.ex

@@ -15,6 +15,8 @@ defmodule Chessh.Game do
     belongs_to(:light_player, Player, foreign_key: :light_player_id)
     belongs_to(:dark_player, Player, foreign_key: :dark_player_id)
 
+    field(:discord_thread_id, :string)
+
     timestamps()
   end
 
@@ -28,7 +30,8 @@ defmodule Chessh.Game do
       :status,
       :last_move,
       :light_player_id,
-      :dark_player_id
+      :dark_player_id,
+      :discord_thread_id
     ])
   end
 end

priv/repo/migrations/20230202004927_add_discord_thread_id.exs

@@ -0,0 +1,7 @@
+defmodule Chessh.Repo.Migrations.AddDiscordThreadId do
+  use Ecto.Migration
+
+  def change do
+
+  end
+end