io.debezium.relational.mapping

Class MaskStrings

java.lang.Object

io.debezium.relational.mapping.MaskStrings

All Implemented Interfaces:

ColumnMapper

public class MaskStrings
extends Object
implements ColumnMapper

A ColumnMapper implementation that ensures that string values are masked. Based on the constructor different masking methods could be used.

Author:

Randall Hauch, Jan-Hendrik Dolling

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	MaskStrings.HashValueConverter
protected static class	MaskStrings.MaskingValueConverter

Field Summary

Fields

Modifier and Type	Field and Description
private Function<Column,ValueConverter>	converterFromColumn

Constructor Summary

Constructors

Constructor and Description
MaskStrings(byte[] salt, String hashAlgorithm) Create a ColumnMapper that masks string values by hashing the input value.
MaskStrings(String maskValue) Create a ColumnMapper that masks string values with a predefined value.

Method Summary

Modifier and Type	Method and Description
void	alterFieldSchema(Column column, org.apache.kafka.connect.data.SchemaBuilder schemaBuilder) Optionally annotate the schema with properties to better capture the mapping behavior.
ValueConverter	create(Column column) Create for the given column a function that maps values.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.debezium.relational.mapping.ColumnMapper

initialize

Field Detail

converterFromColumn

private final Function<Column,ValueConverter> converterFromColumn

Constructor Detail

MaskStrings

public MaskStrings(String maskValue)

Create a ColumnMapper that masks string values with a predefined value.

Parameters:

maskValue - the value that should be used in place of the actual value; may not be null

Throws:

IllegalArgumentException - if the is null

MaskStrings

public MaskStrings(byte[] salt,
                   String hashAlgorithm)

Create a ColumnMapper that masks string values by hashing the input value. The hash is automatically shortened to the length of the column.

Parameters:

salt - the salt that is used within the hash function

hashAlgorithm - the hash function that is used to mask the columns string values written in source records; must be on of Java Cryptography Architecture Standard Algorithm MessageDigest.

Throws:

IllegalArgumentException - if the or are null

Method Detail

create

public ValueConverter create(Column column)

Description copied from interface: ColumnMapper

Create for the given column a function that maps values.

Specified by:

create in interface ColumnMapper

Parameters:

column - the column description; never null

Returns:

the function that converts the value; may be null

alterFieldSchema

public void alterFieldSchema(Column column,
                             org.apache.kafka.connect.data.SchemaBuilder schemaBuilder)

Description copied from interface: ColumnMapper

Optionally annotate the schema with properties to better capture the mapping behavior.

Specified by:

alterFieldSchema in interface ColumnMapper

Parameters:

column - the column definition; never null

schemaBuilder - the builder for the Field's schema; never null