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author | Jay Berkenbilt <ejb@ql.org> | 2023-12-23 14:30:37 +0100 |
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committer | Jay Berkenbilt <ejb@ql.org> | 2023-12-23 14:44:47 +0100 |
commit | 3d33a3a1e3eed4e09a625f81aaa8fcdc67d642e9 (patch) | |
tree | da9fcca510e8c3bea22bf7d38d892c29893d383c | |
parent | 2c14be264b0f2327248a7a0b2e47eb4d12574426 (diff) | |
download | qpdf-3d33a3a1e3eed4e09a625f81aaa8fcdc67d642e9.tar.zst |
Add QPDFAcroFormDocumentHelper::disableDigitalSignatures
-rw-r--r-- | include/qpdf/QPDFAcroFormDocumentHelper.hh | 5 | ||||
-rw-r--r-- | libqpdf/QPDFAcroFormDocumentHelper.cc | 22 |
2 files changed, 27 insertions, 0 deletions
diff --git a/include/qpdf/QPDFAcroFormDocumentHelper.hh b/include/qpdf/QPDFAcroFormDocumentHelper.hh index 8be4d069..f9ad0091 100644 --- a/include/qpdf/QPDFAcroFormDocumentHelper.hh +++ b/include/qpdf/QPDFAcroFormDocumentHelper.hh @@ -163,6 +163,11 @@ class QPDFAcroFormDocumentHelper: public QPDFDocumentHelper QPDF_DLL void generateAppearancesIfNeeded(); + // Disable Digital Signature Fields. Remove all digital signature fields from the document, + // leaving any annotation showing the content of the field intact. + QPDF_DLL + void disableDigitalSignatures(); + // Note: this method works on all annotations, not just ones with associated fields. For each // annotation in old_annots, apply the given transformation matrix to create a new annotation. // New annotations are appended to new_annots. If the annotation is associated with a form diff --git a/libqpdf/QPDFAcroFormDocumentHelper.cc b/libqpdf/QPDFAcroFormDocumentHelper.cc index f2daa0c7..5fdd20ba 100644 --- a/libqpdf/QPDFAcroFormDocumentHelper.cc +++ b/libqpdf/QPDFAcroFormDocumentHelper.cc @@ -416,6 +416,28 @@ QPDFAcroFormDocumentHelper::generateAppearancesIfNeeded() } void +QPDFAcroFormDocumentHelper::disableDigitalSignatures() +{ + std::set<QPDFObjGen> to_remove; + auto fields = getFormFields(); + for (auto& f: fields) { + auto ft = f.getFieldType(); + if (ft == "/Sig") { + auto oh = f.getObjectHandle(); + to_remove.insert(oh.getObjGen()); + // Make this no longer a form field. If it's also an annotation, the annotation will + // survive. If it's only a field and is no longer referenced, it will disappear. + oh.removeKey("/FT"); + // Remove fields that are specific to signature fields. + oh.removeKey("/V"); + oh.removeKey("/SV"); + oh.removeKey("/Lock"); + } + } + removeFormFields(to_remove); +} + +void QPDFAcroFormDocumentHelper::adjustInheritedFields( QPDFObjectHandle obj, bool override_da, |