API: "Field" struct in "form" package does not export fields preventing the access to them

[fbueckle]

Not sure whether this counts as bug or feature request but I believe it is the former due to the way two api functions interact with each other.

General Information

Please ensure the following:

• Used version: 1d309dcd12aa2208402cc103625f56160f743453 aka v0.5.0
• Used OS: Ubuntu 23.04
• Used GoLang Version: 1.21.0.

Bug/Problem Summary

The Field struct used in Forms is not exporting its fields which prevents other projects to access those fields. This leads to problems when trying to "lock" form fields. Scenario goes as follows:

1. Obtain all form fields using the new function FormFields from the api packages
2. Try to extract the IDs of the struct in order to use them as input for LockFormFields which takes a string array as input
3. No field from the Field struct can be accessed due to the fields not being exported

If there is any error on my behalf, please let me know.

[hhrutter]

Fixed with latest commit!

[fbueckle]

Thanks for the quick fix! Is there any chance we could get a hotfix release for this?
Whenever I try to to include a specific commit version I keep running into the error:

go: github.com/pdfcpu/pdfcpu@91b6234dd34dee71c18960c014bfefc0050ac33a: github.com/pdfcpu/pdfcpu@v0.5.1-0.20230821073716-91b6234dd34d: verifying module: github.com/pdfcpu/pdfcpu@v0.5.1-0.20230821073716-91b6234dd34d: reading https://sum.golang.org/lookup/github.com/pdfcpu/pdfcpu@v0.5.1-0.20230821073716-91b6234dd34d: 404 Not Found
        server response: not found

Applying the workaround from #567 (comment) is not possible due to me being restricted in the possibility to alter our used CI Pipelines

[hhrutter]

Please pull, update pdfcpu's dependencies and go install.