Create a Discord forum channel thread

// Create a thread in a Discord forum channel with an opening message.

// Returns the new thread ID, which can be used as channelId in subsequent

// "send message to channel" calls (e.g., script 8859) to post replies in

// that thread.

type DiscordBotConfiguration = {

  // Bot token, sent as `Authorization: Bot <token>`. Preferred field.

  bot_token?: string;

  // Ed25519 key for verifying interactions. Legacy: older resources stored the

  // bot token here, so we fall back to it for backward compatibility.

  public_key?: string;

  application_id: string;

};

export async function main(

  config: DiscordBotConfiguration,

  forum_channel_id: string,

  title: string,

  content: string,

): Promise<{ thread_id: string }> {

  const trimmedTitle = title.length > 100 ? title.slice(0, 97) + "..." : title;

  const truncatedContent = content.slice(0, 2000);

  const url = `https://discord.com/api/v10/channels/${forum_channel_id}/threads`;

  const res = await fetch(url, {

    method: "POST",

    headers: {

      authorization: `Bot ${config.bot_token ?? config.public_key}`,

      "content-type": "application/json",

    },

    body: JSON.stringify({

      name: trimmedTitle,

      message: { content: truncatedContent },

    }),

  });

  if (!res.ok) {

    throw new Error(

      `Discord forum-thread create failed: ${res.status} ${await res.text().catch(() => "")}`,

    );

  }

  const data = (await res.json()) as { id: string };

  return { thread_id: data.id };

}