svn commit: r1794153 - /pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/CreateVisibleSignature.java

[ti...@apache.org]

Author: tilman
Date: Sat May  6 14:32:24 2017
New Revision: 1794153

URL: http://svn.apache.org/viewvc?rev=1794153&view=rev
Log:
PDFBOX-3738: remove /NeedAppearances when there are no previous fields because signature would be invisible in Adobe Reader

Modified:
    pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/CreateVisibleSignature.java

Modified: pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/CreateVisibleSignature.java
URL: http://svn.apache.org/viewvc/pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/CreateVisibleSignature.java?rev=1794153&r1=1794152&r2=1794153&view=diff
==============================================================================
--- pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/CreateVisibleSignature.java (original)
+++ pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/CreateVisibleSignature.java Sat May  6 14:32:24 2017
@@ -164,11 +164,31 @@ public class CreateVisibleSignature exte
             signature = new PDSignature();
         }
 
-        // Optional: certify 
+        // Optional: certify
         if (accessPermissions == 0)
         {
             setMDPPermission(doc, signature, 2);
-        }      
+        }
+
+        PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm();
+        if (acroForm != null && acroForm.getNeedAppearances())
+        {
+            // PDFBOX-3738 NeedAppearances true results in visible signature becoming invisible 
+            // with Adobe Reader
+            if (acroForm.getFields().isEmpty())
+            {
+                // we can safely delete it if there are no fields
+                acroForm.getCOSObject().removeItem(COSName.NEED_APPEARANCES);
+                // note that if you've set MDP permissions, the removal of this item
+                // may result in Adobe Reader claiming that the document has been changed.
+                // and/or that field content won't be displayed properly.
+                // ==> decide what you prefer and adjust your code accordingly.
+            }
+            else
+            {
+                System.out.println("/NeedAppearances is set, signature may be ignored by Adobe Reader");
+            }
+        }
 
         // default filter
         signature.setFilter(PDSignature.FILTER_ADOBE_PPKLITE);