1 files changed, 73 insertions, 0 deletions
diff --git a/pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/pdfbox2/utils/PdfBoxUtils.java b/pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/pdfbox2/utils/PdfBoxUtils.java
new file mode 100644
index 00000000..85073568
--- /dev/null
+++ b/pdf-as-pdfbox-2/src/main/java/at/gv/egiz/pdfas/lib/impl/pdfbox2/utils/PdfBoxUtils.java
@@ -0,0 +1,73 @@
+package at.gv.egiz.pdfas.lib.impl.pdfbox2.utils;
+
+import org.apache.pdfbox.cos.COSArray;
+import org.apache.pdfbox.cos.COSDictionary;
+import org.apache.pdfbox.cos.COSName;
+import org.apache.pdfbox.pdmodel.PDDocument;
+import org.apache.pdfbox.pdmodel.encryption.AccessPermission;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import at.gv.egiz.pdfas.common.exceptions.PdfAsValidationException;
+
+public class PdfBoxUtils {
+	private static final Logger logger = LoggerFactory
+			.getLogger(PdfBoxUtils.class);
+	
+	public static void checkPDFPermissions(PDDocument doc)
+			throws PdfAsValidationException {
+
+		AccessPermission accessPermission = doc.getCurrentAccessPermission();
+		if (doc.isEncrypted()) {
+			throw new PdfAsValidationException("error.pdf.sig.12", null);
+		}
+
+		if (!accessPermission.isOwnerPermission()) {
+			throw new PdfAsValidationException("error.pdf.sig.12", null);
+		}
+
+	}
+
+	public static int countSignatures(PDDocument doc, String sigName) {
+		int count = 0;
+		COSDictionary trailer = doc.getDocument().getTrailer();
+		COSDictionary root = (COSDictionary) trailer
+				.getDictionaryObject(COSName.ROOT);
+		COSDictionary acroForm = (COSDictionary) root
+				.getDictionaryObject(COSName.ACRO_FORM);
+		COSArray fields = (COSArray) acroForm
+				.getDictionaryObject(COSName.FIELDS);
+		for (int i = 0; i < fields.size(); i++) {
+			COSDictionary field = (COSDictionary) fields.getObject(i);
+			String type = field.getNameAsString("FT");
+			if ("Sig".equals(type)) {
+				String name = field.getString(COSName.T);
+				if (name != null) {
+					logger.debug("Found Sig: " + name);
+					try {
+						if (name.startsWith(sigName)) {
+							String numberString = name.replace(sigName, "");
+
+							logger.debug("Found Number: " + numberString);
+
+							int SigIDX = Integer.parseInt(numberString);
+							if (SigIDX > count) {
+								count = SigIDX;
+							}
+						}
+					} catch (Throwable e) {
+						logger.info("Found a different Signature, we do not need to count this.");
+					}
+				}
+			}
+
+		}
+
+		count++;
+
+		logger.debug("Returning sig number: " + count);
+
+		return count;
+	}
+
+}