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Posted to commits@pdfbox.apache.org by ti...@apache.org on 2017/10/25 18:28:05 UTC
svn commit: r1813334 -
/pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/SigUtils.java
Author: tilman
Date: Wed Oct 25 18:28:04 2017
New Revision: 1813334
URL: http://svn.apache.org/viewvc?rev=1813334&view=rev
Log:
PDFBOX-1848: Create utility class with MDP methods to avoid double code in timestamp and signature classes
Added:
pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/SigUtils.java (with props)
Added: pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/SigUtils.java
URL: http://svn.apache.org/viewvc/pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/SigUtils.java?rev=1813334&view=auto
==============================================================================
--- pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/SigUtils.java (added)
+++ pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/SigUtils.java Wed Oct 25 18:28:04 2017
@@ -0,0 +1,115 @@
+/*
+ * Copyright 2017 The Apache Software Foundation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.pdfbox.examples.signature;
+
+import org.apache.pdfbox.cos.COSArray;
+import org.apache.pdfbox.cos.COSBase;
+import org.apache.pdfbox.cos.COSDictionary;
+import org.apache.pdfbox.cos.COSName;
+import org.apache.pdfbox.pdmodel.PDDocument;
+import org.apache.pdfbox.pdmodel.interactive.digitalsignature.PDSignature;
+
+/**
+ *
+ * @author Tilman Hausherr
+ */
+public class SigUtils
+{
+
+ /**
+ * Get the access permissions granted for this document in the DocMDP transform parameters dictionary. Details are
+ * described in the table "Entries in the DocMDP transform parameters dictionary" in the PDF specification.
+ *
+ * @param doc document.
+ * @return the permission value. 0 means no DocMDP transform parameters dictionary exists. Other return values are
+ * 1, 2 or 3. 2 is also returned if the DocMDP transform parameters dictionary is found but did not contain a /P
+ * entry, or if the value is outside the valid range.
+ */
+ static public int getMDPPermission(PDDocument doc)
+ {
+ COSBase base = doc.getDocumentCatalog().getCOSObject().getDictionaryObject(COSName.PERMS);
+ if (base instanceof COSDictionary)
+ {
+ COSDictionary permsDict = (COSDictionary) base;
+ base = permsDict.getDictionaryObject(COSName.DOCMDP);
+ if (base instanceof COSDictionary)
+ {
+ COSDictionary signatureDict = (COSDictionary) base;
+ base = signatureDict.getDictionaryObject("Reference");
+ if (base instanceof COSArray)
+ {
+ COSArray refArray = (COSArray) base;
+ for (int i = 0; i < refArray.size(); ++i)
+ {
+ base = refArray.getObject(i);
+ if (base instanceof COSDictionary)
+ {
+ COSDictionary sigRefDict = (COSDictionary) base;
+ if (COSName.DOCMDP.equals(sigRefDict.getDictionaryObject("TransformMethod")))
+ {
+ base = sigRefDict.getDictionaryObject("TransformParams");
+ if (base instanceof COSDictionary)
+ {
+ COSDictionary transformDict = (COSDictionary) base;
+ int accessPermissions = transformDict.getInt(COSName.P, 2);
+ if (accessPermissions < 1 || accessPermissions > 3)
+ {
+ accessPermissions = 2;
+ }
+ return accessPermissions;
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ return 0;
+ }
+
+ static public void setMDPPermission(PDDocument doc, PDSignature signature, int accessPermissions)
+ {
+ COSDictionary sigDict = signature.getCOSObject();
+
+ // DocMDP specific stuff
+ COSDictionary transformParameters = new COSDictionary();
+ transformParameters.setItem(COSName.TYPE, COSName.getPDFName("TransformParams"));
+ transformParameters.setInt(COSName.P, accessPermissions);
+ transformParameters.setName(COSName.V, "1.2");
+ transformParameters.setNeedToBeUpdated(true);
+
+ COSDictionary referenceDict = new COSDictionary();
+ referenceDict.setItem(COSName.TYPE, COSName.getPDFName("SigRef"));
+ referenceDict.setItem("TransformMethod", COSName.getPDFName("DocMDP"));
+ referenceDict.setItem("DigestMethod", COSName.getPDFName("SHA1"));
+ referenceDict.setItem("TransformParams", transformParameters);
+ referenceDict.setNeedToBeUpdated(true);
+
+ COSArray referenceArray = new COSArray();
+ referenceArray.add(referenceDict);
+ sigDict.setItem("Reference", referenceArray);
+ referenceArray.setNeedToBeUpdated(true);
+
+ // Catalog
+ COSDictionary catalogDict = doc.getDocumentCatalog().getCOSObject();
+ COSDictionary permsDict = new COSDictionary();
+ catalogDict.setItem(COSName.PERMS, permsDict);
+ permsDict.setItem(COSName.DOCMDP, signature);
+ catalogDict.setNeedToBeUpdated(true);
+ permsDict.setNeedToBeUpdated(true);
+ }
+}
Propchange: pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/SigUtils.java
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