When will PDF signing be supported?

[JorjMcKie]

Signing PDF document signing is an important feature - and the base library MuPDF supports it.
However, PyMuPDF does not yet.

The reasons:

• We know that MuPDF must be installed before PyMuPDF can be built. These two steps both happen when PyMuPDF's wheels are being created (using the great Travis CI service).
• MuPDF installation material is complete and self-sufficient: it contains all its required thirdparty software (like ZIP, Freetype, OpenJPEG, Harfbuzz, etc.) in folder thirdparty.
• The previous is not true for OpenSSL: it must be installed separately before installing MuPDF. OpenSSL is a prerequisite for MuPDF to support PDF signing. Unfortunately, there does not seem to exist a common installation procedure for all three wheel platforms OSX, Linux and Windows.
• A well-defined, repeatable installation approach is however required, before I can even think of supporting PDF document signing in PyMuPDF.

[hbh112233abc]

Dear JoriMcKie
I think you can remark how to sign pdf with pymupdf in the guide document.
And the guide document show use sign function must install OpenSSL before

[jloehel]

How can I support you?

[JorjMcKie]

Most valuable would be an installtion procedure from sources on platform Linux:

• download & install OpenSSL
• download MuPDF
• determine MuPDF installation parameter adjustments for OpenSSL
• install MuPDF
• download & setp.py PyMuPDF sources

Once such a script works it would be no major problem to make a GitHub Action from it, that generates wheels.
It should also be no rocket science to port such a script to Mac OSX.

As far as Windows is concerned, I would take of it.

[jloehel]

Most valuable would be an installtion procedure from sources on platform Linux:

* download & install OpenSSL

* download MuPDF

* determine MuPDF installation parameter adjustments for OpenSSL

* install MuPDF

* download & setp.py PyMuPDF sources

Once such a script works it would be no major problem to make a GitHub Action from it, that generates wheels. It should also be no rocket science to port such a script to Mac OSX.

As far as Windows is concerned, I would take of it.

What Linux do you use for building? Ubuntu? In the spec for OpenSUSE it's enough to add openssl to the build requirements: https://build.opensuse.org/package/view_file/Publishing/mupdf/mupdf.spec?expand=1

[JorjMcKie]

On my machine I use WSL Ubuntu. Github Actions the same.

[jloehel]

Hi @JorjMcKie,

Sorry for the really long delay. I looked into the signing thingie but I realized that PDF document signing with mupdf is a little bit hacky. The document needs already the necessary objects sig, stamp objects in-place. I am using now pyHanko for signing the documents. It's much easier to create a stamp for the documents after the creation with pymupdf.