org.apache.parquet.hadoop.util.ColumnEncryptor Maven / Gradle / Ivy
/*
* 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.parquet.hadoop.util;
import java.io.IOException;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.parquet.bytes.BytesInput;
import org.apache.parquet.crypto.FileEncryptionProperties;
import org.apache.parquet.hadoop.metadata.ColumnPath;
import org.apache.parquet.hadoop.rewrite.ParquetRewriter;
import org.apache.parquet.hadoop.rewrite.RewriteOptions;
import org.apache.parquet.hadoop.util.CompressionConverter.TransParquetFileReader;
/**
* This class is for fast rewriting existing file with column encryption
*
* For columns to be encrypted, all the pages of those columns are read, but decompression/decoding,
* it is encrypted immediately and write back.
*
* For columns not to be encrypted, the whole column chunk will be appended directly to writer.
*/
@Deprecated
public class ColumnEncryptor {
private Configuration conf;
public ColumnEncryptor(Configuration conf) {
this.conf = conf;
}
/**
* Given the input file, encrypt the columns specified by paths, and output the file.
* The encryption settings can be specified in the parameter of fileEncryptionProperties
*
* @param inputFile Input file
* @param outputFile Output file
* @param paths columns to be encrypted
* @param fileEncryptionProperties FileEncryptionProperties of the file
* @throws IOException
*/
public void encryptColumns(
String inputFile, String outputFile, List paths, FileEncryptionProperties fileEncryptionProperties)
throws IOException {
Path inPath = new Path(inputFile);
Path outPath = new Path(outputFile);
RewriteOptions options = new RewriteOptions.Builder(conf, inPath, outPath)
.encrypt(paths)
.encryptionProperties(fileEncryptionProperties)
.build();
ParquetRewriter rewriter = new ParquetRewriter(options);
rewriter.processBlocks();
rewriter.close();
}
public byte[] readBlock(int length, TransParquetFileReader reader) throws IOException {
byte[] data = new byte[length];
reader.blockRead(data, 0, length);
return data;
}
public BytesInput readBlockAllocate(int length, TransParquetFileReader reader) throws IOException {
byte[] data = new byte[length];
reader.blockRead(data, 0, length);
return BytesInput.from(data, 0, length);
}
public static Set convertToColumnPaths(List cols) {
Set prunePaths = new HashSet<>();
for (String col : cols) {
prunePaths.add(ColumnPath.fromDotString(col));
}
return prunePaths;
}
}