/*
* Copyright 2016 Victor Albertos
*
* 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 io.rx_cache2.internal.encrypt;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.channels.FileChannel;
import javax.inject.Inject;
public final class FileEncryptor {
private static final String SUFFIX_TMP = "-tmp";
private final Encryptor encryptor;
@Inject public FileEncryptor(Encryptor encryptor) {
this.encryptor = encryptor;
}
public File encrypt(String key, File file) {
if (!file.exists()) return file;
String filenameInput = file.getAbsolutePath();
file = rename(file, new File(filenameInput + SUFFIX_TMP));
File fileOutput = new File(filenameInput);
encryptor.encrypt(key, file, fileOutput);
file.delete();
return fileOutput;
}
public File decrypt(String key, File file) {
if (!file.exists()) return file;
String filenameInput = file.getAbsolutePath();
File fileOutput = new File(filenameInput + SUFFIX_TMP);
encryptor.decrypt(key, file, fileOutput);
return fileOutput;
}
private File rename(File fileSrc, File fileDst) {
FileChannel inputChannel = null;
FileChannel outputChannel = null;
try {
inputChannel = new FileInputStream(fileSrc).getChannel();
outputChannel = new FileOutputStream(fileDst).getChannel();
inputChannel.transferTo(0, inputChannel.size(), outputChannel);
fileSrc.delete();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (inputChannel != null) {
inputChannel.close();
}
if (outputChannel != null) {
outputChannel.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
return fileDst;
}
}