Lambda + API Gatewayを利用してherokuのDeploy HooksをSlackに通知する (要Lambda Proxy Integration)

send_heroku_deploy_notification_to_slack.js

const https = require('https');
const querystring = require('querystring');
const url = require('url');
const SLACK_URL = url.parse('__YOUR_SLACK_WEBHOOK_URL__');
const slackOptions = {
    channel: '#heroku',
    username: 'heroku',
    icon_emoji: ':heroku:'
};

exports.handler = (event, context, callback) => {
    const data = querystring.parse(event.body);

    const done = (err, res) => callback(null, {
        statusCode: err ? '400' : '200',
        body: err ? err.message : JSON.stringify(res),
        headers: {
            'Content-Type': 'application/json',
        },
    });

    const postData = JSON.stringify(Object.assign({}, slackOptions, {
        attachments: [{
            color: "good",
            pretext: `${data.user} deployed version ${data.head} of ${data.app}`,
            text: data.git_log,
            fields: [{
                title: "URL",
                value: data.url,
                short: false
            }]
        }]
    }));

    const httpOptions = {
        host: SLACK_URL.host,
        port: 443,
        path: SLACK_URL.path,
        method: "POST",
        headers: {
            'Content-Type': 'application/json',
            'Content-Length': postData.length
        }
    };

    const req = https.request(httpOptions, (res) => {
        res.setEncoding('utf8');
        let responseBody = '';
        res.on('data', (chunk) => {
            responseBody += chunk;
        })
        res.on('end', () => {
            done(null, { message: responseBody });
        });
    })
    req.on('error', (e) => {
        console.log(`problem with request : ${e.message}`);
        done(e);
    });
    req.write(postData);
    req.end();
};