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Part of the A Slack bot that replies to mentions guide on docs.val.town.
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import { fetchJSON } from "https://esm.town/v/stevekrouse/fetchJSON?v=41";
import process from "node:process";
export const slackReplyToMessage = async (
req: express.Request,
res: express.Response,
) => {
// Verify the request is genuine
if (req.body.token !== process.env.slackVerificationToken) {
return res.status(401);
}
// Respond to the initial challenge (when events are enabled)
if (req.body.challenge) {
return res.send({ challenge: req.body.challenge });
}
// Reply to app_mention events
if (req.body.event.type === "app_mention") {
// Note: `req.body.event` has information about the event
// like the sender and the message text
const result = await fetchJSON(
"https://slack.com/api/chat.postMessage",
{
headers: {
"Authorization": `Bearer ${process.env.slackToken}`,
},
method: "POST",
body: JSON.stringify({
channel: req.body.event.channel,
thread_ts: req.body.event.ts,
text: "Hello, ~World~ from Val Town!",
}),
},
);
// Slack replies with information about the created message
console.log(result);
}
};
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