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MJson.java
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MJson.java
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/*
* Copyright © 2022 Mark Raynsford <code@io7m.com> https://www.io7m.com
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package com.io7m.mesquida.internal;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.json.JsonMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.io7m.dixmont.core.DmJsonRestrictedDeserializers;
import java.util.Set;
import static com.fasterxml.jackson.databind.DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES;
/**
* Functions to create secure JSON mappers.
*/
public final class MJson
{
private MJson()
{
}
/**
* Create a JSON mapper that may only deserialize values of the given
* classes.
*
* @param classes The list of allowed classes
*
* @return A mapper
*/
public static ObjectMapper createMapper(
final Set<String> classes)
{
final JsonMapper mapper =
JsonMapper.builder()
.enable(FAIL_ON_UNKNOWN_PROPERTIES)
.build();
final var deserializers =
DmJsonRestrictedDeserializers.builder()
.allowClassNames(classes)
.build();
final var simpleModule = new SimpleModule();
simpleModule.setDeserializers(deserializers);
mapper.registerModule(simpleModule);
return mapper;
}
}