Direct Upload: missing error check for checksum

[qqmyers]

Although the Guides say the checksum is required (see https://guides.dataverse.org/en/latest/developers/s3-direct-upload-api.html#adding-the-uploaded-file-to-the-dataset) the code doesn't do an upfront check to provide a useful 400/error message. Instead, the call eventually gets to code for the normal upload process and tries/fails to calculate the checksum on an assumed temp file copy (which doesn't exist), resulting in a failure to write a null checksum to the datafile table. The code should check for the checksum in the submitted jsonData (in the old or new format) and send a 400 error if it is missing.

Thanks to JHU/ @donsizemore for reporting.

What steps does it take to reproduce the issue? Call the direct upload API as in the guides but omit a checksum.

Which version of Dataverse are you using?
Dataverse 6.1 and earlier