/**
 * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */
package at.gv.egiz.pdfas.utils;

import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.pdfbox.pdmodel.PDDocument;

import at.gv.egiz.pdfas.exceptions.ErrorCode;
import at.knowcenter.wag.egov.egiz.exceptions.PDFDocumentException;

import com.lowagie.text.pdf.PdfReader;

/**
 * @author tknall
 */
public class PDFASUtils {
//23.11.2010 changed by exthex - added checkDocumentPermissions(PDDocument doc)
   
   private PDFASUtils() {
   }
   
   /**
    * Verifies that a document could be opened with full permissions. 
    * @param pdfReader The PdfReader
    * @throws PDFDocumentException Thrown if document has not been opened with full permissions.
    */
   public static void checkReaderPermissions(PdfReader pdfReader) throws PDFDocumentException {
      if (pdfReader.isEncrypted()) {
         throw new PDFDocumentException(ErrorCode.DOCUMENT_IS_PROTECTED, "Document is encrypted.");
      }
      if (!pdfReader.isOpenedWithFullPermissions()) {
         throw new PDFDocumentException(ErrorCode.DOCUMENT_IS_PROTECTED, "Document is protected.");
      }
   }

   public static boolean toFile(byte[] data, File file) throws IOException {
      return PDFASUtils.toFile(new ByteArrayInputStream(data), file);
   }

   public static boolean toFile(InputStream inputStream, File file) throws IOException {
      boolean result = false;
      BufferedOutputStream bufferedOutputStream = null;
      try {
         bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(file));
         ConfigUtils.writeInputStreamToOutputStream(inputStream, bufferedOutputStream);
      } finally {
         if (bufferedOutputStream != null) {
            try {
               bufferedOutputStream.close();
               result = true;
            } catch (IOException e) {
               result = false;
            }
         }
      }
      return result;
   }

    public static void checkDocumentPermissions(PDDocument doc) throws PDFDocumentException {
      if (doc.isEncrypted()) {
        throw new PDFDocumentException(ErrorCode.DOCUMENT_IS_PROTECTED, "Document is encrypted.");
      }
    }
   
}