Watermark your messages in slack via Proxypin

slack-watermark.js

console.log("Request handler started");

async function onRequest(context, request) {
  console.log("Incoming request:", context);

  if (!context.session.channelHistory) {
    context.session.channelHistory = [];
  }

  const k = JSON.parse(request.body);
  const k2 = JSON.parse(k.blocks);

  const channelId = k.channel;
  const now = Date.now();

  const lastMessage = context.session.channelHistory.find(
    (msg) => msg.channelId === channelId,
  );
  const lastMessageTime = lastMessage ? lastMessage.timestamp : 0;

  if (now - lastMessageTime > 1800000) {
    k2.push({
      type: "divider",
    });

    k2.push({
      type: "context",
      elements: [
        {
          type: "mrkdwn",
          text: "_sent from ios_",
        },
      ],
    });
  }

  context.session.channelHistory = context.session.channelHistory.filter(
    (msg) => msg.channelId !== channelId,
  );
  context.session.channelHistory.push({
    channelId,
    timestamp: now,
  });

  k.blocks = JSON.stringify(k2);
  request.body = JSON.stringify(k);
  return request;
}

async function onResponse(context, request, response) {
  return response;
}