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https://issues.apache.org/jira/browse/PDFBOX-3547?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr updated PDFBOX-3547:
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Summary: [Patch] Improved signing of existing signature fields (was:
[Patch]Improved signing of existing signature fields)
> [Patch] Improved signing of existing signature fields
> -----------------------------------------------------
>
> Key: PDFBOX-3547
> URL: https://issues.apache.org/jira/browse/PDFBOX-3547
> Project: PDFBox
> Issue Type: Improvement
> Components: Signing
> Affects Versions: 2.0.4
> Reporter: Lonzak
> Assignee: Tilman Hausherr
> Fix For: 2.0.4, 2.1.0
>
> Attachments: CreateVisibleSignature.patch, PDDocument.patch
>
>
> *Short*: The handling of signing existing signature fields must be improved
> (and this patch is part of that effort).
> *Details and background*
> The current implementation for visible signatures always adds new signature
> fields when signing documents.
> In that case for that signature everything has to be definied (field
> properties, coordinates etc.).
> Another quite common use case is the use of an existing signature field which
> should be signed.
> There are basically two different roles: The *document creator* who creates
> the document with all its texts, graphics and form fields. The creator knows
> best where everything should be positioned and is even sometimes bound by
> certain regulations etc. The document creator defines his intend with the
> "Usage rights" and may add a usage right signature.
> Then later a *document user* e.g. a customer fills out form fields and signs
> those predefined signature fields.
> In that case the coordinates and a lot of attributes are alrady defined and
> there is no need (and sometimes it is even forbidden) to change the physical
> attributes of those signature fields. The only two things which are of
> interest is to set the signature dictionary and to recreate the appearance.
> In the current implementation however one needs to define the coordinates of
> an existing signature field again. But not enough since the screen
> coordinates in java (and in the PDFBox PDVisibleSigBuilder) and PDF
> coordinates have a different origin one must convert those existing PDF
> coordinates to screen coordinates which are later converted to PDF
> coordinates again. This is cumbersome, error prone and totally unecessary...
> With the supplied patch there is no conversion of coordinates anymore.
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