Is it possible to upload a PDF file through AWS API Gateway and a lambda function to a S3 bucket?

Question

I need to upload a PDF file using a web application to s3 bucket. I am following serverless architecture with AWS lambda. Is this possible with AWS API Gateway and lambda? I am using node by the way.

Answer 1

Yes, this is possible and there are many different solutions. I would suggest using API Gateway as a proxy to S3 and skipping the Lambda function on upload. Then you can use S3 events to run any necessary Lambda functions for processing the object after upload.

Answer 2

The most convenient/efficient way to upload to S3 is by using presigned urls . By doing so, you delegate on S3 proven API to do the heavy lifting for you.

Your application would use a lambda function just to get the presigned url, then the upload would be directly to S3, and of course you can process the file with a second lambda once it uploads.

You can see a write-up of a similar solution (without API Gateway) at Stratosparks's blog