How come AWS S3 is erasing my extension from PDF files

Question

In my current app, I've successfully been able to upload PDFs to my storage. The problem is, when I download the file, it doesn't have an extension and cannot be opened. I have to add .pdf to the end of the file for it to be recognized (and it does open the correct file).

However in my app, my file already has a .pdf extension, and I know is uploading properly because I'm able to download and open.

Here is my code please help:

 { fieldname: ‘files’,
  originalname: ‘tsunami_zone_e_final.pdf’,
  encoding: ‘7bit’,
  mimetype: ‘application/pdf’,
  size: 2310366,
  bucket: ‘company-name-dev’,
  key: ‘123456789999’,
  acl: ‘public-read’,
  contentType: ‘application/octet-stream’,
  contentDisposition: null,
  storageClass: ‘STANDARD’,
  serverSideEncryption: null,
  metadata: [Object],
  location: ‘https://company-name.s3.us-west-2.amazonaws.com/1521233750192',
  etag: ‘“12345etag12345etag12345”’ } ] }

Answer 1

I think the problem should be with your content-header. Be assured, you write it in the correct format.

You will also have to specify Content-Disposition to make sure your file is downloaded in the same originalname property value.

Below is the code with Nodejs S3 SDK:

var params = {
  Body: <Binary String>, 
  Bucket: "youbucket", 
  Key: "1521233750192", 
  ContentDisposition: 'attachment; filename="tsunami_zone_e_final.pdf";', // from `originalname`
  ContentType: 'application/pdf', // from `mimetype`
 };

 s3.putObject(params, function(err, data) {
   if (err) console.log(err, err.stack); // an error occurred
   else     console.log(data);           // successful response
 });

Answer 2

I am not sure what language/framework you are using but you should make sure to pass the correct Content-Type header. You will also need Content-Disposition header to make sure your file is downloaded with the same originalname property value. And once most browsers will allow for inline display of pdfs, you may also want to force the download (also using Content-Disposition).