[justinopsky]

I need to check if a uploaded file in a grid have a valid digital signature.
Can this be done before the form is submited ? In case of invalid digital signature, the user has a alert to replace the invalid files.
Thanks

[amosbatto]

ProcessMaker Enterprise Edition supports E-Lock and Sigplus digital signatures:
https://www.processmaker.com/digitally- ... orms-elock
https://www.processmaker.com/electronic ... ature-pads

If you don't want to use those two methods, you can upload an image file that contains a digital signature. I don't know of any way to check it, aside from verifying that it is an image file. If that is all you want, then these code examples will help you get started:
https://www.pmusers.com/index.php/Multiple_Files

You can set your code to be executed either by form.setOnchange() or form.setOnSubmit(). This example might help you:
https://www.pmusers.com/index.php/Check ... nside_grid

[justinopsky]

Thanks, but what i need is only verify if a pdf file have a validated digital signature, not as image but as digital certificate.
But thanks anyway.

[amosbatto]

You can analyze the format of the PDF file and then create a trigger which opens the file in binary and checks for that format.

What device are you using to create the digital signature? The manufacturer of the device may have software to check if a signature PDF.