Correctly handle cancellable uploads

[toniopelo]

Today upload cancellation is handle in frontend only.
The already uploaded parts indefinitely (depending on the bucket lifecycle rules) stays on the cloud provider object storage and people are billed for these unfinished uploads.
To avoid this, the client package must send a request to the backend one in order to perform a proper cancel request to the cloud provider and free the unfinished file parts.

[troggy]

There is no-code solution available: you can add lifecycle rule to the bucket which stops the uploads after a certain period of time (depending on your use case).

For instance, this rule will stop uploads after 5 days (it is assumed that if I upload wasn't finished in 5 days it is safe to stop it):

{
  "Rules": [
      {
          "ID": "stop-stale-uploads",
          "Status": "Enabled",
          "Filter": {
              "Prefix": ""
          },
          "AbortIncompleteMultipartUpload": {
              "DaysAfterInitiation": 5
          }
      }
  ]
}

Apply in AWS S3 console or in CLI with

# assuming the rule json is in s3-lifecycle-delete-stale.json file
aws s3api put-bucket-lifecycle-configuration --bucket <BUCKET_NAME> --lifecycle-configuration file://s3-lifecycle-delete-stale.json