Implement API for downloading multiple files from storage as a ZIP file

[nowgnuesLee]

Motivation  

• Currently, even though there are many files, only one file can be downloaded at a time. For convenience, it seems necessary to implement a feature that allows multiple files to be downloaded at once.

Required Features

• When multiple files are selected, I plan to send a single ZIP file containing those files to the client (there’s an existing function that streams ZIP files, so I intend to reuse that).
• To compress multiple files, we need a common parent directory for the files, so I intend to change the folder structure as follows:
  • Target
    folder/file.png
  • Current
    folder.zip extract> file.png
  • Updated
    folder.zip extract> folder/file.png

Impact  

• Using the token received from storage, I intend to update the existing download_directory_as_archive function so that it can handle not only directories but also multiple files when creating a ZIP file.

Testing Scenarios  

• Test if a single file/folder is returned correctly files as individual files and folders as ZIP files.
• Test if multiple files (files + folders) are returned in a ZIP file named after the common parent folder.