AWS lambda for sending Slack messages from Figma Hooks API

figma_hooks_slack.js

const https = require('https');
const querystring = require('querystring');

/**
 * Pass the data to send as `event.data`, and the request options as
 * `event.options`. For more information see the HTTPS module documentation
 * at https://nodejs.org/api/https.html.
 *
 * Will succeed with the response body.
 */
exports.handler = (event, context, callback) => {
    
    // passcode is configured in the Figma Hooks API
    const passcode = 'your-passcode';
    // slack channel webhook url
    const slackHookHostname = 'hooks.slack.com';
    const slackHookLocation = '/your-url-location/';
    
    
    function messageComment(hookPayload) {
    	let comment = [];
    	let color = ''
    	
    	hookPayload.comment.map(item => {
			if (!!item.mention) {
				comment.push(`@${hookPayload.mentions.filter(mention => (mention.id == item.mention))[0].handle}`);
			} else
			if (!!item.text) {
				comment.push(item.text);
			}
    	})
    	
    	if (hookPayload.file_name.toLowerCase().search('production') != -1) {
    		color = '#52B287'
    	} else if (hookPayload.file_name.toLowerCase().search('proposals') != -1) {
    		color = '#FCC565'
    	} else if (hookPayload.file_name.toLowerCase().search('explorations') != -1) {
    		color = '#E86253'
    	} else {
    		color = '#979FBD'
    	}
    	
    	return {
    		icon_emoji: ':figma:',
    		username: 'Figma',
			attachments:[{
				fallback: `New comment in <https://www.figma.com/file/${hookPayload.file_key}/|${hookPayload.file_name}>`,
				pretext: `New comment in <https://www.figma.com/file/${hookPayload.file_key}/|${hookPayload.file_name}>`,
				color: color,
				fields:[{
					title: hookPayload.triggered_by.handle,
					value: comment.join(''),
					short: false
				}]
			}]
		}
    }
    
    function testMessage() {
    	return {
    		icon_emoji: ':figma:',
    		username: `Test`,
    		text: `test message`
    	}
    }
    
    console.log('invokation', event)
    
    
   	if (!!event.body) {
		let invokationBody = JSON.parse(event.body)
		
		if (invokationBody.passcode == passcode) {
			const payload = querystring.stringify({ 'payload': JSON.stringify(messageComment(invokationBody)) })
			const options = {
				hostname: slackHookHostname,
				path: slackHookLocation,
				method: 'POST',
				headers: {
					'Content-Type': 'application/x-www-form-urlencoded',
			    	'Content-Length': Buffer.byteLength(payload)
				}
			}
			
			const req = https.request(options, res => {
				console.log(`STATUS: ${res.statusCode}`);
	
				let body = ''
				res.on('data', d => body += d)
				res.on('end', () => {
					console.log('sent to slack', event)
	        		callback(null, event)
				})
	
			})
	
			req.on('error', error => {
			  console.error(error)
			})
	
			req.write(payload)
			req.end()
		} else {
			 callback(null, 'passcode not valid or not present')
		}
       
    } else {
         callback(null, 'no body field present')
    }
};