shangxinli commented on a change in pull request #808: URL: https://github.com/apache/parquet-mr/pull/808#discussion_r509863658
########## File path: parquet-hadoop/src/test/java/org/apache/parquet/crypto/propertiesfactory/SchemaCryptoPropertiesFactory.java ########## @@ -0,0 +1,135 @@ +/* + * 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.crypto.propertiesfactory; + +import org.apache.hadoop.conf.Configuration; +import org.apache.hadoop.fs.Path; +import org.apache.parquet.crypto.ColumnEncryptionProperties; +import org.apache.parquet.crypto.DecryptionKeyRetrieverMock; +import org.apache.parquet.crypto.DecryptionPropertiesFactory; +import org.apache.parquet.crypto.EncryptionPropertiesFactory; +import org.apache.parquet.crypto.FileDecryptionProperties; +import org.apache.parquet.crypto.FileEncryptionProperties; +import org.apache.parquet.crypto.ParquetCipher; +import org.apache.parquet.crypto.ParquetCryptoRuntimeException; +import org.apache.parquet.hadoop.api.WriteSupport.WriteContext; +import org.apache.parquet.hadoop.metadata.ColumnPath; +import org.apache.parquet.schema.MessageType; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.nio.charset.StandardCharsets; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +public class SchemaCryptoPropertiesFactory implements EncryptionPropertiesFactory, DecryptionPropertiesFactory { + + private static Logger log = LoggerFactory.getLogger(SchemaCryptoPropertiesFactory.class); + + public static final String CONF_ENCRYPTION_ALGORITHM = "parquet.encryption.algorithm"; + public static final String CONF_ENCRYPTION_FOOTER = "parquet.encrypt.footer"; + private static final byte[] FOOTER_KEY = {0x01, 0x02, 0x03, 0x4, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, + 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10}; + private static final byte[] FOOTER_KEY_METADATA = "footkey".getBytes(StandardCharsets.UTF_8); + private static final byte[] COL_KEY = {0x02, 0x03, 0x4, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, + 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11}; + private static final byte[] COL_KEY_METADATA = "col".getBytes(StandardCharsets.UTF_8); + + @Override + public FileEncryptionProperties getFileEncryptionProperties(Configuration conf, Path tempFilePath, + WriteContext fileWriteContext) throws ParquetCryptoRuntimeException { + MessageType schema = fileWriteContext.getSchema(); + List<String[]> paths = schema.getPaths(); + if (paths == null || paths.isEmpty()) { + throw new ParquetCryptoRuntimeException("Null or empty fields is found"); + } + + Map<ColumnPath, ColumnEncryptionProperties> columnPropertyMap = new HashMap<>(); + + for (String[] path : paths) { + getColumnEncryptionProperties(path, columnPropertyMap, conf); + } + + if (columnPropertyMap.size() == 0) { + log.debug("No column is encrypted. Returning null so that Parquet can skip. Empty properties will cause Parquet exception"); + return null; + } + + /** + * Why we still need footerKeyMetadata even withEncryptedFooter as false? According to the + * 'Plaintext Footer' section of + * https://github.com/apache/parquet-format/blob/encryption/Encryption.md, the plaintext footer + * is signed in order to prevent tampering with the FileMetaData contents. So footerKeyMetadata + * is always needed. This signature will be verified if parquet-mr code is with parquet-1178. + * Otherwise, it will be ignored. + */ + boolean shouldEncryptFooter = getEncryptFooter(conf); + FileEncryptionProperties.Builder encryptionPropertiesBuilder = + FileEncryptionProperties.builder(FOOTER_KEY) + .withFooterKeyMetadata(FOOTER_KEY_METADATA) + .withAlgorithm(getParquetCipherOrDefault(conf)) + .withEncryptedColumns(columnPropertyMap); + if (!shouldEncryptFooter) { + encryptionPropertiesBuilder = encryptionPropertiesBuilder.withPlaintextFooter(); + } + FileEncryptionProperties encryptionProperties = encryptionPropertiesBuilder.build(); + log.info( + "FileEncryptionProperties is built with, algorithm:{}, footerEncrypted:{}", + encryptionProperties.getAlgorithm(), + encryptionProperties.encryptedFooter()); + return encryptionProperties; + } + + private ParquetCipher getParquetCipherOrDefault(Configuration conf) { + String algorithm = conf.get(CONF_ENCRYPTION_ALGORITHM, "AES_GCM_CTR_V1"); + log.debug("Encryption algorithm is {}", algorithm); + return ParquetCipher.valueOf(algorithm.toUpperCase()); + } + + private boolean getEncryptFooter(Configuration conf) { + boolean encryptFooter = conf.getBoolean(CONF_ENCRYPTION_FOOTER, false); + log.debug("Encrypt Footer: {}", encryptFooter); + return encryptFooter; + } + + private void getColumnEncryptionProperties(String[] path, Map<ColumnPath, ColumnEncryptionProperties> columnPropertyMap, + Configuration conf) throws ParquetCryptoRuntimeException { + String pathName = String.join(".", path); + String columnKeyName = conf.get(pathName, null); Review comment: fixed ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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