org.apache.parquet.crypto.DecryptionPropertiesFactory Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.parquet.crypto;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.parquet.hadoop.BadConfigurationException;
import org.apache.parquet.hadoop.util.ConfigurationUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* DecryptionPropertiesFactory interface enables transparent activation of Parquet decryption.
*
* Its customized implementations produce decryption properties for each Parquet file, using the input information
* available in Parquet file readers: file path and Hadoop configuration properties that can pass custom parameters
* required by a crypto factory. A factory implementation can use or ignore any of these inputs.
*
* The example usage could be as below.
* 1. Write a class to implement DecryptionPropertiesFactory.
* 2. Set configuration of "parquet.crypto.factory.class" with the fully qualified name of this class.
* For example, we can set the configuration in SparkSession as below.
* SparkSession spark = SparkSession
* .config("parquet.crypto.factory.class",
* "xxx.xxx.DecryptionPropertiesClassLoaderImpl")
*
* The implementation of this interface will be instantiated by {@link #loadFactory(Configuration)}.
*/
public interface DecryptionPropertiesFactory {
Logger LOG = LoggerFactory.getLogger(DecryptionPropertiesFactory.class);
String CRYPTO_FACTORY_CLASS_PROPERTY_NAME = "parquet.crypto.factory.class";
/**
* Load DecryptionPropertiesFactory class specified by CRYPTO_FACTORY_CLASS_PROPERTY_NAME as the path in the configuration
*
* @param conf Configuration where user specifies the class path
* @return object with class DecryptionPropertiesFactory if user specified the class path and invoking of
* the class succeeds. Null if user doesn't specify the class path (no decryption factory then - not required for plaintext files.
* Or for plaintext columns in encrypted files with plaintext footer).
* @throws BadConfigurationException if the instantiation of the configured class fails
*/
static DecryptionPropertiesFactory loadFactory(Configuration conf) {
final Class decryptionPropertiesFactoryClass = ConfigurationUtil.getClassFromConfig(
conf, CRYPTO_FACTORY_CLASS_PROPERTY_NAME, DecryptionPropertiesFactory.class);
if (null == decryptionPropertiesFactoryClass) {
LOG.debug("DecryptionPropertiesFactory is not configured - name not found in hadoop config");
return null;
}
try {
return (DecryptionPropertiesFactory) decryptionPropertiesFactoryClass.newInstance();
} catch (InstantiationException | IllegalAccessException e) {
throw new BadConfigurationException(
"could not instantiate decryptionPropertiesFactoryClass class: " + decryptionPropertiesFactoryClass,
e);
}
}
/**
* Get FileDecryptionProperties object which is created by the implementation of this interface. Please see
* the unit test SampleDecryptionPropertiesFactory for example
*
* @param hadoopConfig Configuration that is used to pass the needed information, e.g. KMS uri
* @param filePath File path of the parquet file
* Can be used for AAD prefix verification, part of key metadata etc
* @return object with class of FileDecryptionProperties. Null return value means no decryption properties
* are available for the file (not required for plaintext files. Or for plaintext columns in encrypted files with plaintext footer).
* @throws ParquetCryptoRuntimeException if there is an exception while creating the object
*/
FileDecryptionProperties getFileDecryptionProperties(Configuration hadoopConfig, Path filePath)
throws ParquetCryptoRuntimeException;
}