Error in Redetect File Type API

[helkv]

Executing the Redetect File Type API-Call (https://guides.dataverse.org/en/latest/api/native-api.html#redetect-file-type) results in multiple Exceptions, if the original filetype is text/plain and S3 is used as File-Storage.
The result is an incorrect filetype detection and the file being removed from the index.

Equivalent Issue from IQSS/Dataverse: IQSS#7527 & IQSS#7631

Server: All instances
Date of Test: 06.07.2022
Browser: -
Version: i.a. Dataverse v. 5.10.1 / v. 5.11
User: -

Preconditions:

• S3 as File-Storage
• Plain Text as original File Type of the File

Actions:

1. Call the Redetect File Type API: {{base_url}}/api/files/64/redetect?dryRun=false
2. Result:
   • Incorrect result of the API-Call
   • The file is missing in the Solr index

Root of the Error:

1. The File Type is checked on a temporary File (.tmp) when using S3
2. Method FileUtil.determineFileTypeByExtension() returns null for .tmp-File with text/plain as File Type
3. JPA/EJB Exceptions because Type of a File must not be null
4. Indexing of the File fails because of the preceding errors (NPE while indexing the Dataset)

Server.log with the related Errors:
Server_Log_with_Redetect_File_Type_Errors.log