Zoom recording to S3 using an AWS Lambda

I was using Pipedream to store my Zoom recordings in S3 but they changed the pricing and it is not free anymore. So, I decided that this would be a fun project in any case.

ChatGPT wasn't very helpful, eventually this repo helped me. Here's the final code:

import { S3Client } from '@aws-sdk/client-s3';
import crypto from 'crypto';
import { nanoid } from 'nanoid';
import { Upload } from '@aws-sdk/lib-storage';
import got from 'got';
import { format } from 'date-fns';

const zoomSecretToken = process.env.ZOOM_SECRET_TOKEN;
const s3 = new S3Client({ region: "us-east-1" });

const bucketName = "...";

export const handler = async (event) => {
  try {
    const headers = event.headers;
    const zoomEvent = typeof event.body === 'string' ? JSON.parse(event.body) : event.body;

    if (zoomEvent.event === 'endpoint.url_validation') {
      const encryptedToken = crypto.createHmac('sha256', zoomSecretToken).update(zoomEvent.payload.plainToken).digest('hex');
      return {
        statusCode: 200,
        body: JSON.stringify({ plainToken: zoomEvent.payload.plainToken, encryptedToken })
      }
    } else if (zoomEvent.event !== 'recording.completed') {
      return { statusCode: 422, body: 'Invalid event type' };
    }

    const meetingId = zoomEvent.payload.object.id;
    const datePath = format(new Date(), 'yyyy-MM-dd');

    // Retrieve recording URLs from the event payload
    const recordingFiles = zoomEvent.payload.object.recording_files;

    const videoRecordings = recordingFiles.filter(file => file.file_type === "MP4" && !file.recording_type.includes("audio"));
    if (videoRecordings.length === 0) {
      return { statusCode: 409, body: 'No video recordings found' };
    }

    const file = videoRecordings[0];
    const fileUrl = file.download_url + "?access_token=" + zoomEvent.download_token;
    const filepath = `videos/${meetingId}/${datePath}/${nanoid(10)}.${file.file_type.toLowerCase()}`;

    // Download the file and upload to S3
    await uploadToS3(fileUrl, bucketName, filepath);

    return {
      statusCode: 200,
      body: 'Zoom recording successfully uploaded to S3',
    };
  } catch (error) {
    return {
      statusCode: 500,
      body: JSON.stringify({ message: 'Error uploading Zoom recording', error: error.message }),
    };
  }
};

// Helper function to upload file from URL to S3
const uploadToS3 = async (fileUrl, bucketName, key) => {
  const stream = got.stream(fileUrl);

  const upload = new Upload({
    client: s3,
    params: {
      Bucket: bucketName,
      Key: key,
      Body: stream,
      ContentType: 'video/mp4',
      ACL: 'public-read',
    },
  });

  const result = await upload.done();
  return result;
};

My package.json:

{
  "name": "zoom-to-s3",
  "version": "1.0.0",
  "description": "",
  "main": "index.mjs",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "zip": "zip -r function.zip ."
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@aws-sdk/client-lambda": "^3.659.0",
    "date-fns": "^4.1.0",
    "got": "^14.4.2",
    "nanoid": "^5.0.7",
    "postmark": "^4.0.5"
  }
}

And my .github/workflows/deploy.yml to deploy it when I push to main:

name: Deploy Lambda

on:
  push:
    branches:
      - main

jobs:
  deploy:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout Code
        uses: actions/checkout@v3

      - name: Setup Node.js
        uses: actions/setup-node@v3
        with:
          node-version: '20'

      - name: Install Dependencies
        run: npm install

      - name: Zip Lambda Function
        run: npm run zip

      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v2
        with:
          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          aws-region: us-east-1

      - name: Deploy Lambda
        run: |
          aws lambda update-function-code \
            --function-name zoom-recording-to-s3 \
            --zip-file fileb://function.zip