com.exlibris.dps.repository.plugin.riskExtractor.drmlint.PDFBoxWrapper.java Source code

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Here is the source code for com.exlibris.dps.repository.plugin.riskExtractor.drmlint.PDFBoxWrapper.java

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/*
 * Copyright 2013 The British Library/SCAPE Project Consortium
 * Author: William Palmer (William.Palmer@bl.uk)
 *
 *   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 com.exlibris.dps.repository.plugin.riskExtractor.drmlint;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.exceptions.COSVisitorException;
import org.apache.pdfbox.pdfparser.PDFParser;
import org.apache.pdfbox.pdmodel.encryption.AccessPermission;

/**
 * Class to wrap the Apache PDFBox library
 * @author wpalmer
 *
 */
public class PDFBoxWrapper {

    private PDFBoxWrapper() {
        // TODO Auto-generated constructor stub
    }

    /**
     * Check if a PDF file is valid or not
     * @param pFile file to check
     * @return whether the file is valid or not
     */
    public static boolean isValid(File pFile) {
        boolean ret = false;
        try {
            PDFParser parser = new PDFParser(new FileInputStream(pFile));
            parser.parse();
            File temp = File.createTempFile("drmlint-temp-", ".pdf");
            parser.getPDDocument().save(temp);
            parser.getDocument().close();
            temp.delete();
            ret = true;
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (COSVisitorException e) {
            // TODO Auto-generated catch block
            ret = false;
        }
        return ret;
    }

    /**
     * Check if a PDF file has DRM or not
     * @param pFile file to check
     * @return whether the file is had DRM or not
     */
    public static boolean hasDRM(File pFile) {
        boolean ret = false;
        try {
            PDFParser parser = new PDFParser(new FileInputStream(pFile));
            parser.parse();
            ret = parser.getDocument().isEncrypted();
            parser.getDocument().close();

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return ret;
    }

    /**
     * Check for encryption with Apache PDFBox
     * -> query the encryption dictionary (might allow more granular checks of protection)
     * @param pPDF pdf file to check
     * @return whether or not the file has DRM
     */
    public static boolean hasDRMGranular(File pPDF) {

        boolean ret = false;

        try {
            PDFParser parser = new PDFParser(new FileInputStream(pPDF));
            parser.parse();

            COSDictionary dict = parser.getDocument().getEncryptionDictionary();
            if (dict != null) {

                //print encryption dictionary
                //            for(COSName key:dict.keySet()) {
                //               System.out.print(key.getName());
                //               String value = dict.getString(key);
                //               if(value!=null){
                //                  System.out.println(": "+value);
                //               } else {
                //                  System.out.println(": "+dict.getLong(key));
                //               }
                //            }

                //this feaure in pdfbox is currently broken, see: https://issues.apache.org/jira/browse/PDFBOX-1651
                //AccessPermission perms = parser.getPDDocument().getCurrentAccessPermission();
                //this is a work around; creating a new object from the data
                AccessPermission perms = new AccessPermission(dict.getInt("P"));

                boolean debug = false;

                if (debug) {

                    System.out.println("canAssembleDocument()        : " + perms.canAssembleDocument());
                    System.out.println("canExtractContent()          : " + perms.canExtractContent());
                    System.out.println("canExtractForAccessibility() : " + perms.canExtractForAccessibility());
                    System.out.println("canFillInForm()              : " + perms.canFillInForm());
                    System.out.println("canModify()                  : " + perms.canModify());
                    System.out.println("canModifyAnnotations()       : " + perms.canModifyAnnotations());
                    System.out.println("canPrint()                   : " + perms.canPrint());
                    System.out.println("canPrintDegraded()           : " + perms.canPrintDegraded());
                    System.out.println("isOwnerPermission()          : " + perms.isOwnerPermission());
                    System.out.println("isReadOnly()                 : " + perms.isReadOnly());

                }
            }

            parser.getDocument().close();

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return ret;
    }
}