Slack Notification Filter using webtask.io

slack-notification-filter.js

var request = require('request');

function shouldNotify(data) {
    //replace this with the appropriate check/filter for you
    return data.text.includes("should notify");
}

module.exports = function (context, done) {
    if (context.data.token == context.data.EXPECTED_TOKEN) {
        if (shouldNotify(context.data)) {

            var url = context.data.WEBHOOK_URL;
            var slackTeamBaseUrl = "https://" + context.data.team_domain + ".slack.com/";
            var originalMessageLink = slackTeamBaseUrl + "archives/" + context.data.channel_name + "/p" + context.data.timestamp.replace(".", "");
            var msg = {
                attachments: [
                    {
                        "fallback": "<<plain text summary, used by clients that don't show attachments>> ",
                        "color": "#2992CC",
                        "author_name": context.data.user_name,
                        "author_link": slackTeamBaseUrl + "team/" + context.data.user_name,
                        "pretext": "<<your comment on the notification>>",
                        "text": context.data.text + '\n<' + originalMessageLink + '|Original Message>',
                        "ts": context.data.timestamp
                    }
                ]
            };
            request({url: url, method: 'POST', json: msg}, function (error, res, body) {
                if (error) {
                    console.error(error);
                }
                done(null, null);
            });
        }
        else {
            done(null, null);
        }
    }
    else {
        console.error("invalid token:" + context.data.token);
        done(null, null);
    }
};