Send slack webhook from AWS Lambda on AWS SNS notification (single script without library)

notifySlackAWSLambda.js

// NodeJS v12
const https = require('https')

const send = data => {
    const options = {
        hostname: 'hooks.slack.com',
        port: 443,
        path: '/services/<webhook-id>',
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'Content-Length': data.length
        }
    }
    return new Promise((resolve, reject) => {
        const req = https.request(options, res => {
            console.log('code = ', res.statusCode)
            console.log('headers = ', res.headers)
            res.on('data', console.log.bind('[data]'))
            res.on('end', resolve)
            res.on('error', reject)
        })
        req.on('error', reject)
        req.write(data)
        req.end()
    })
}
exports.handler = async event => {
    const text = event.Records.map(record => record.Sns.Message).join('\n')
    await send(JSON.stringify({text}))
    return {
        statusCode: 200,
        body: JSON.stringify(`Sent message ${text}`)
    }
}

https://github.com/ciaranj/node-oauth/blob/a7f8a1e21c362eb4ed2039431fb9ac2ae749f26a/lib/oauth2.js

https://nodejs.org/en/knowledge/HTTP/clients/how-to-create-a-HTTP-request/

https://nodejs.dev/learn/making-http-requests-with-nodejs