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/*
* ====================================================================
* 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.poi.xssf.streaming;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import org.apache.commons.io.output.NullOutputStream;
import org.apache.commons.io.output.UnsynchronizedByteArrayOutputStream;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.openxml4j.util.ZipEntrySource;
import org.apache.poi.poifs.crypt.temp.AesZipFileZipEntrySource;
import org.apache.poi.poifs.crypt.temp.EncryptedTempData;
import org.apache.poi.poifs.crypt.temp.SXSSFWorkbookWithCustomZipEntrySource;
import org.apache.poi.util.IOUtils;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.junit.jupiter.api.Test;
/**
* This class tests that an SXSSFWorkbook can be written and read where all temporary disk I/O
* is encrypted, but the final saved workbook is not encrypted
*/
public final class TestSXSSFWorkbookWithCustomZipEntrySource {
final String sheetName = "TestSheet1";
final String cellValue = "customZipEntrySource";
// write an unencrypted workbook to disk, but any temporary files are encrypted
@Test
void customZipEntrySource() throws IOException {
UnsynchronizedByteArrayOutputStream os = UnsynchronizedByteArrayOutputStream.builder().setBufferSize(8192).get();
try (SXSSFWorkbookWithCustomZipEntrySource workbook = new SXSSFWorkbookWithCustomZipEntrySource()) {
SXSSFSheet sheet1 = workbook.createSheet(sheetName);
SXSSFRow row1 = sheet1.createRow(1);
SXSSFCell cell1 = row1.createCell(1);
cell1.setCellValue(cellValue);
workbook.write(os);
workbook.close();
workbook.dispose();
}
try (XSSFWorkbook xwb = new XSSFWorkbook(os.toInputStream())) {
XSSFSheet xs1 = xwb.getSheetAt(0);
assertEquals(sheetName, xs1.getSheetName());
XSSFRow xr1 = xs1.getRow(1);
XSSFCell xc1 = xr1.getCell(1);
assertEquals(cellValue, xc1.getStringCellValue());
}
}
// write an encrypted workbook to disk, and encrypt any temporary files as well
@Test
void customZipEntrySourceForWriteAndRead() throws IOException, InvalidFormatException {
EncryptedTempData tempData = new EncryptedTempData();
try (SXSSFWorkbookWithCustomZipEntrySource workbook = new SXSSFWorkbookWithCustomZipEntrySource()) {
SXSSFSheet sheet1 = workbook.createSheet(sheetName);
SXSSFRow row1 = sheet1.createRow(1);
SXSSFCell cell1 = row1.createCell(1);
cell1.setCellValue(cellValue);
try (OutputStream os = tempData.getOutputStream()) {
workbook.write(os);
}
workbook.close();
workbook.dispose();
}
try (InputStream is = tempData.getInputStream();
ZipEntrySource zipEntrySource = AesZipFileZipEntrySource.createZipEntrySource(is)) {
tempData.dispose();
try (OPCPackage opc = OPCPackage.open(zipEntrySource);
XSSFWorkbook xwb = new XSSFWorkbook(opc)) {
XSSFSheet xs1 = xwb.getSheetAt(0);
assertEquals(sheetName, xs1.getSheetName());
XSSFRow xr1 = xs1.getRow(1);
XSSFCell xc1 = xr1.getCell(1);
assertEquals(cellValue, xc1.getStringCellValue());
}
}
}
@Test
void validateTempFilesAreEncrypted() throws IOException {
TempFileRecordingSXSSFWorkbookWithCustomZipEntrySource workbook = new TempFileRecordingSXSSFWorkbookWithCustomZipEntrySource();
SXSSFSheet sheet1 = workbook.createSheet(sheetName);
SXSSFRow row1 = sheet1.createRow(1);
SXSSFCell cell1 = row1.createCell(1);
cell1.setCellValue(cellValue);
workbook.write(NullOutputStream.INSTANCE);
List<File> tempFiles = workbook.getTempFiles();
assertEquals(1, tempFiles.size());
File tempFile = tempFiles.get(0);
assertTrue(tempFile.exists(), "tempFile exists?");
try (InputStream stream = new FileInputStream(tempFile)) {
byte[] data = IOUtils.toByteArray(stream);
String text = new String(data, UTF_8);
assertFalse(text.contains(sheetName));
assertFalse(text.contains(cellValue));
}
workbook.dispose();
assertFalse(tempFile.exists(), "tempFile deleted after dispose?");
workbook.close();
}
}
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