GitLab merge request pinger Cloudflare Worker

worker.js

// How to use:
// 1. Add IDs below
// 2. Deploy this on a cloudflare worker
// 3. Go to "Discord Notifications" GitLab integration settings.
// 4. Put the URL of the webhook, but with "discord.com" replaced with URL of your worker in 
//    "A merge request is created, merged, closed, or reopened" field and if you want to be 
//    pinged for comments, in "A comment is added" as well.

const discordIds = [
  "219067402174988290", // alula
];

const discordIdsStr = discordIds.map(id => `<@${id}>`).join(" ");

/**
 * @type {ExportedHandlerFetchHandler}
 */
async function onFetch(request, env, ctx) {
  const url = new URL(request.url);
  console.log(request.method, url.toString());

  if (!url.pathname.startsWith("/api/webhooks")) {
    return new Response(JSON.stringify({code: 401, message: "Bad Request"}), {status: 401});
  }

  url.host = "discord.com";
  const discordURL = url.toString();

  let body = undefined;

  if (request.method === "POST") {
    body = await request.json();
    if (body.embeds?.length) {
      const embed = body.embeds[0];

      if (embed.description?.includes("merge request")) {
        body.content = discordIdsStr + " " + body.content;
      }
    }

    console.log("body", body);
  }

  const discordResp = await fetch(discordURL, {
    body: body ? JSON.stringify(body) : undefined,
    headers: request.headers,
    method: request.method,
  });

  const discordBody = discordResp.status !== 204 ? await discordResp.text() : null;

  return new Response(discordBody, {
    headers: discordResp.headers,
    status: discordResp.status,
  });
};

/**
 * @type {ExportedHandler}
 */
export default {
  fetch: onFetch,
};