[Enhancement] File preview using dangerzone (sandboxing for preview)

[AkechiShiro]

Hi @Rafiot,

Following your workshop I attended at PassTheSalt 2024, I'm opening this issue to track the improvement of using https://github.com/freedomofpress/dangerzone instead of LibreOffice to open documents and create previews.

To quote dangerzone's README :

Some features

• Sandboxes don't have network access, so if a malicious document can compromise one, it can't phone home
• Sandboxes use gVisor, an application kernel written in Go, that implements a substantial portion of the Linux system call interface.
• Dangerzone can optionally OCR the safe PDFs it creates, so it will have a text layer again
• Dangerzone compresses the safe PDF to reduce file size

Dangerzone can convert these types of document into safe PDFs:

• PDF (.pdf)
• Microsoft Word (.docx, .doc)
• Microsoft Excel (.xlsx, .xls)
• Microsoft PowerPoint (.pptx, .ppt)
• ODF Text (.odt)
• ODF Spreadsheet (.ods)
• ODF Presentation (.odp)
• ODF Graphics (.odg)
• Hancom HWP (Hangul Word Processor) (.hwp, .hwpx)
• EPUB (.epub)
• Jpeg (.jpg, .jpeg)
• GIF (.gif)
• PNG (.png)
• SVG (.svg)
• other image formats (.bmp, .pnm, .pbm, .ppm)