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From til...@apache.org
Subject svn commit: r1813334 - /pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/signature/SigUtils.java
Date Wed, 25 Oct 2017 18:28:05 GMT
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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    svn:eol-style = native



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