org.apache.pdfbox.examples.signature.ShowSignature Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of pdfbox-examples Show documentation
The Apache PDFBox library is an open source Java tool for working with PDF documents. This artefact contains examples on how the library can be used.
There is a newer version: 3.0.3
Show newest version
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.util.Collection;

import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSString;
import org.apache.pdfbox.pdmodel.PDDocument;

/**
 * This will read a document from the filesystem, decrypt it and do something with the signature.
 *
 * @author Ben Litchfield
 */
public final class ShowSignature
{
    private ShowSignature()
    {
    }

    /**
     * This is the entry point for the application.
     *
     * @param args The command-line arguments.
     *
     * @throws IOException If there is an error reading the file.
     * @throws CertificateException
     */
    public static void main( String[] args ) throws IOException, CertificateException
    {
        ShowSignature show = new ShowSignature();
        show.showSignature( args );
    }

    private void showSignature( String[] args ) throws IOException, CertificateException
    {
        if( args.length != 2 )
        {
            usage();
        }
        else
        {
            String password = args[0];
            String infile = args[1];
            PDDocument document = null;
            try
            {
                document = PDDocument.load( new File(infile), password );
                if( !document.isEncrypted() )
                {
                    System.err.println( "Warning: Document is not encrypted." );
                }

                COSDictionary trailer = document.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 certs = factory.generateCertificates( certStream );
                                    System.out.println( "certs=" + certs );
                                }
                                else if( subFilter.getName().equals( "adbe.pkcs7.sha1" ) )
                                {
                                    COSString certString = (COSString)cert.getDictionaryObject(
                                        COSName.CONTENTS );
                                    byte[] certData = certString.getBytes();
                                    CertificateFactory factory = CertificateFactory.getInstance( "X.509" );
                                    ByteArrayInputStream certStream = new ByteArrayInputStream( certData );
                                    Collection certs = factory.generateCertificates( certStream );
                                    System.out.println( "certs=" + certs );
                                }
                                else
                                {
                                    System.err.println( "Unknown certificate type:" + subFilter );
                                }
                            }
                            else
                            {
                                throw new IOException( "Missing subfilter for cert dictionary" );
                            }
                        }
                        else
                        {
                            System.out.println( "Signature found, but no certificate" );
                        }
                    }
                }
            }
            finally
            {
                if( document != null )
                {
                    document.close();
                }
            }
        }
    }

    /**
     * This will print a usage message.
     */
    private static void usage()
    {
        System.err.println( "usage: java " + ShowSignature.class.getName() +
                            " " );
    }
}