1 files changed, 131 insertions, 0 deletions
diff --git a/src/main/java/org/pdfbox/pdmodel/encryption/PDEncryptionManager.java b/src/main/java/org/pdfbox/pdmodel/encryption/PDEncryptionManager.java
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+++ b/src/main/java/org/pdfbox/pdmodel/encryption/PDEncryptionManager.java
@@ -0,0 +1,131 @@
+/**
+ * Copyright (c) 2003-2004, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.pdmodel.encryption;
+
+import org.pdfbox.cos.COSDictionary;
+import org.pdfbox.cos.COSName;
+import java.io.IOException;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * This class will handle loading of the different security handlers.
+ *
+ * See PDF Reference 1.4 section "3.5 Encryption"
+ *
+ * @author  Ben Litchfield (ben@csh.rit.edu)
+ * @version $Revision: 1.5 $
+ */
+public class PDEncryptionManager
+{
+    private static Map handlerMap = Collections.synchronizedMap( new HashMap() );
+
+    static
+    {
+        registerSecurityHandler( PDStandardEncryption.FILTER_NAME, PDStandardEncryption.class );
+    }
+
+    private PDEncryptionManager()
+    {
+    }
+
+    /**
+     * This will allow the user to register new security handlers when unencrypting a
+     * document.
+     *
+     * @param filterName As described in the encryption dictionary.
+     * @param handlerClass A subclass of PDEncryptionDictionary that has a constructor that takes
+     *        a COSDictionary.
+     */
+    public static void registerSecurityHandler( String filterName, Class handlerClass )
+    {
+        handlerMap.put( COSName.getPDFName( filterName ), handlerClass );
+    }
+
+    /**
+     * This will get the correct security handler for the encryption dictionary.
+     *
+     * @param dictionary The encryption dictionary.
+     *
+     * @return An implementation of PDEncryptionDictionary(PDStandardEncryption for most cases).
+     *
+     * @throws IOException If a security handler could not be found.
+     */
+    public static PDEncryptionDictionary getEncryptionDictionary( COSDictionary dictionary )
+        throws IOException
+    {
+        Object retval = null;
+        if( dictionary != null )
+        {
+            COSName filter = (COSName)dictionary.getDictionaryObject( COSName.FILTER );
+            Class handlerClass = (Class)handlerMap.get( filter );
+            if( handlerClass == null )
+            {
+                throw new IOException( "No handler for security handler '" + filter.getName() + "'" );
+            }
+            else
+            {
+                try
+                {
+                    Constructor ctor = handlerClass.getConstructor( new Class[] {
+                        COSDictionary.class
+                    } );
+                    retval = ctor.newInstance( new Object[] {
+                        dictionary
+                    } );
+                }
+                catch( NoSuchMethodException e )
+                {
+                    throw new IOException( e.getMessage() );
+                }
+                catch( InstantiationException e )
+                {
+                    throw new IOException( e.getMessage() );
+                }
+                catch( IllegalAccessException e )
+                {
+                    throw new IOException( e.getMessage() );
+                }
+                catch( InvocationTargetException e )
+                {
+                    throw new IOException( e.getMessage() );
+                }
+            }
+        }
+        return (PDEncryptionDictionary)retval;
+
+    }
+}
+\ No newline at end of file