Upload binary image file

Serverless Framework
1

I’m trying to upload a binary file directly to a lambda for storing in s3.
It seems to work except the outcome has the same size but is not a readable png.
Any idea which conversation is missing?

  //support binary files
  if (typeof event === 'string'){    
    params.Body = new Buffer(event, "binary");
    params.Key = 'binary/' + Math.round(Math.random()*1000000);
    if (event.substr(0,10).indexOf('PNG') > -1){
        params.Key += '.png';
    }
  }

Test via

serverless invoke local --function hello --path bot.png -l true

2

You need to make sure the object’s ContentType (aka. MIME type) is set correctly - the CLI tool will take care of this for you, but if you’re doing your upload with the SDK you will need to do it yourself.

3

Have you thought about using direct upload to S3 instead of going via Lambda? See http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-authentication-HTTPPOST.html

1 Like
4

I tried that and hit the wall. AWS Docs are fuzzy and their example only works with text files. The most I came forward is to upload a corrupted image using this AWS S3 service proxy approach.