PDF file attachments

[miliog]

Description

I'd like to be able to create PDF attachments.

(Screenshot from https://helpx.adobe.com/acrobat/using/links-attachments-pdfs.html#)

Use Case

It's very convenient to add file attachments to the PDF itself. Not only Acrobat Reader, but also many open source readers support it.

[ghost]

Here is an example code in LaTeX that shows how to embed the file in the list of embedded files, set the flags and also reuse the embedded binary in a File Attachement Annotation. Maybe it helps the person who wants to implement this.

\pdfcompresslevel=0
\pdfobjcompresslevel=0

\documentclass[a4paper]{article}

\usepackage{embedfile}
\usepackage{attachfile2}
\expandafter\xdef\csname theatfi@flags\endcsname{704}
\newcommand{\clickablefile}[2]{%
\embedfile[ucfilespec={#1}]{#1}%
%\expandafter\xdef\csname atfi@embed@file@#1\endcsname{\the\numexpr\pdflastobj-1}%
\expandafter\xdef\csname atfi@fileobj@#1\endcsname{\the\numexpr\pdflastobj-1}%
\textattachfile[ucfilespec={#1},icon={Paperclip}]{#1}{#2}%
}

\begin{document}

\clickablefile{test.txt}{Double click to export the file}

\end{document}

embed.pdf

[tingerrr]

This seems like a good-contribution, the relevant sections in the PDF 1.7 spec are 12.5.6.15 and 7.11.4, these features would have to be upstreamed into pdf-wirter before typst can support this.

[awehrfritz]

... these features would have to be upstreamed into pdf-wirter before typst can support this.

As far as I can tell, pdf-writer has support for this already: https://github.com/typst/pdf-writer/commit/ba040ace792d57a2e57e4973a38abb1561cdc057