Clean up attachment-*.tmp files in <confluence_install>/temp directory.

Summary

Many attachment-*.tmp files remain in <confluence_install>/temp after uploading attachment files to a Page with REST API.

Thousands of attachment-*.tmp files remain in <confluence_install>/temp directory.
Sometimes amount of total file sizes become several GB.
those files are not deleted by scheduled job, since the job deletes files in <confluence_home>/temp.

Environment

• Confluence 5.9.9

Steps to Reproduce

1. curl -v -S -u admin:password -X POST -H "X-Atlassian-Token: no-check" -F "file=@myfile.txt" -F "comment=this is my file" "http://localhost:8090/rest/api/content/<page id>/child/attachment" | python -mjson.tool
2. check <confluence_install>/temp directory.

Expected Results

Temporary files should be deleted after completing the REST API.
or
A scheduled job deletes them.

Actual Results

Temporary files remain after competing REST API program.
And when Confluence is stopped, those tmp files are deleted.
This means those files maybe remain in temp directory for long term.

Workaround

Remove the files from <confluence_install>/temp manually, or implemente a cronjob in the operating system to cleanup the folder.