SignatureFieldsExtractor added

1 files changed, 33 insertions, 0 deletions

diff --git a/pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/pdfbox2/placeholder/SignatureFieldsExtractor.java b/pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/pdfbox2/placeholder/SignatureFieldsExtractor.java
new file mode 100644
index 00000000..a8473858
--- /dev/null
+++ b/pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/pdfbox2/placeholder/SignatureFieldsExtractor.java
@@ -0,0 +1,33 @@
+package at.gv.egiz.pdfas.lib.impl.pdfbox2.placeholder;
+
+import org.apache.pdfbox.pdmodel.PDDocument;
+import org.apache.pdfbox.pdmodel.interactive.digitalsignature.PDSignature;
+import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
+import org.apache.pdfbox.pdmodel.interactive.form.PDField;
+import org.apache.pdfbox.pdmodel.interactive.form.PDSignatureField;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SignatureFieldsExtractor {
+
+    //Search for empty signature fields
+    public static List<String> findEmptySignatureFields(PDDocument doc)
+    {
+        PDSignature signature;
+        List<PDField> signatureField;
+        List<String> signatureFieldNames = new ArrayList<>();
+        PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm();
+        if (acroForm != null) {
+            signatureField = acroForm.getFields();
+            for (PDField pdField : signatureField) {
+                if(pdField instanceof PDSignatureField && pdField.getPartialName()!=null)
+                {
+                    signature = ((PDSignatureField) pdField).getSignature();
+                    if(signature == null) signatureFieldNames.add(pdField.getPartialName());
+                }
+            }
+        }
+        return signatureFieldNames;
+    }
+}