Programmatic Uploads

Agenda

• Announcements
• Code review
• Lecture
• Lab intro

Notes

Setup Your S3 Bucket for Uploading

• Create a new S3 Bucket
• Create an "open" policy

{
    "Version": "2012-10-17",
    "Id": "Policy1562466412724",
    "Statement": [
        {
            "Sid": "Stmt1562466394793",
            "Effect": "Allow",
            "Principal": "*",
            "Action": "s3:*",
            "Resource": "YOUR ARN HERE
        }
    ]
}

Front End Code

• You'll need to use an html form, POSTing to your server, using the encoding type "multipart"
  • <form action="http://localhost:3000/route" method="post" enctype="multipart/form-data">
  • Every input field must have a name
  • You must have an <input type='file' /> to store the file for upload
• Multi Part forms are broken into sections or chunks by the browser, simulating TCP-like packets so the back-end server can handle large amounts of data
• These chunks are split by "boundaries", which your application needs to digest, not unlike
  • Query Strings
  • Post Data
  • JSON Body

------WebKitFormBoundaryCN5NrYyqER1HdCXn
Content-Disposition: form-data; name="person"

Johnny Socko
------WebKitFormBoundaryCN5NrYyqER1HdCXn
Content-Disposition: form-data; name="old"

false
------WebKitFormBoundaryCN5NrYyqER1HdCXn
Content-Disposition: form-data; name="file"; filename=""
Content-Type: application/octet-stream

BinaryFileNonsenseInHere...

Server Code

On the server side, you'll need to connect to your S3 Bucket using your AWS Developer Credentials.

References

• Programmatic S3 uploads with Java
• Uploading to AWS with Spring Boot