From ba0bfe16e391c13d67a34ea216e9b40ea0751c04 Mon Sep 17 00:00:00 2001
From: emusic <emina.music@egiz.gv.at>
Date: Tue, 19 Nov 2019 17:08:32 +0100
Subject: SignatureFieldsExtractor added

---
 .../placeholder/SignatureFieldsExtractor.java      | 33 ++++++++++++++++++++++
 .../impl/signing/pdfbox2/PADESPDFBOXSigner.java    | 22 +--------------
 2 files changed, 34 insertions(+), 21 deletions(-)
 create mode 100644 pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/pdfbox2/placeholder/SignatureFieldsExtractor.java

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;
+    }
+}
diff --git a/pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/signing/pdfbox2/PADESPDFBOXSigner.java b/pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/signing/pdfbox2/PADESPDFBOXSigner.java
index ccf99902..c37002c4 100644
--- a/pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/signing/pdfbox2/PADESPDFBOXSigner.java
+++ b/pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/signing/pdfbox2/PADESPDFBOXSigner.java
@@ -35,6 +35,7 @@ import at.gv.egiz.pdfas.lib.impl.ErrorExtractor;
 import at.gv.egiz.pdfas.lib.impl.SignaturePositionImpl;
 import at.gv.egiz.pdfas.lib.impl.configuration.SignatureProfileConfiguration;
 import at.gv.egiz.pdfas.lib.impl.pdfbox2.PDFBOXObject;
+import at.gv.egiz.pdfas.lib.impl.pdfbox2.placeholder.SignatureFieldsExtractor;
 import at.gv.egiz.pdfas.lib.impl.pdfbox2.positioning.Positioning;
 import at.gv.egiz.pdfas.lib.impl.pdfbox2.utils.PdfBoxUtils;
 import at.gv.egiz.pdfas.lib.impl.placeholder.PlaceholderFilter;
@@ -872,7 +873,6 @@ public class PADESPDFBOXSigner implements IPdfSigner, IConfigurationConstants {
 	// Find an existing signature.
 	private PDSignature findExistingSignature(PDDocument doc, String sigFieldName)
 	{
-		findEmptySignatureFields(doc);
 		PDSignature signature = null;
 		PDSignatureField signatureField;
 		PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm();
@@ -899,24 +899,4 @@ public class PADESPDFBOXSigner implements IPdfSigner, IConfigurationConstants {
 		}
 		return signature;
 	}
-
-	//Find empty signature fields
-	private 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;
-	}
 }
\ No newline at end of file
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