On 2023-07-03, Bram Moolenaar <b...@moolenaar.net> wrote:
> I suppose encrypting the file won't be possible, since the reader does
> not know how to decrypt it. Or does the Preview app support encryption
> somehow?
Yes, macOS's Preview supports (at least some?) encrypted PDFs. I did
a quick test by encrypting a random PDF document with qpdf:
qpdf --encrypt PASSWORD OWNERPASSWORD 256 -- in.pdf out.pdf
and by opening out.pdf with Preview, which prompted for a password
before opening the document.
> The alternative is to not use a temp file but write the text through a
> pipe/socket. That also avoids the need to find the right moment to
> delete the temp file. Can we do this somehow?
With Preview? I don't think so. But if one wants to get fancy, the PDF
can be written to the system clipboard and then Preview can be asked to
create a new document from the clipboard's content (using AppleScript).
Then, the clipboard content can be erased.
Or, even better, one could create a (sufficiently large) RAM disk with
something like:
hdiutil attach -nomount ram://204800
diskutil erasevolume APFS TempDisk /dev/diskN
use it as volatile storage, then destroy it:
diskutil eject /Volumes/TempDisk
The RAM disk can likely be formatted with an encrypted file system, too.
Life.
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