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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2019, 2021 AT&T Intellectual Property. All rights reserved.
* Modifications Copyright (C) 2023 Nordix Foundation.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.endpoints.http.server;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonSyntaxException;
import jakarta.ws.rs.Consumes;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.MultivaluedMap;
import jakarta.ws.rs.ext.MessageBodyReader;
import jakarta.ws.rs.ext.MessageBodyWriter;
import jakarta.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;
import org.onap.policy.common.gson.GsonMessageBodyHandler;
import org.onap.policy.common.utils.coder.YamlJsonTranslator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.yaml.snakeyaml.error.YAMLException;
/**
* Provider that serializes and de-serializes YAML via snakeyaml and gson.
*/
@Provider
@Consumes(MediaType.WILDCARD)
@Produces(MediaType.WILDCARD)
public class YamlMessageBodyHandler implements MessageBodyReader<Object>, MessageBodyWriter<Object> {
public static final Logger logger = LoggerFactory.getLogger(YamlMessageBodyHandler.class);
public static final String APPLICATION_YAML = "application/yaml";
/**
* Translator that's used when none is specified. We want a GSON object that's
* configured the same way as it is in {@link GsonMessageBodyHandler}, so just get it
* from there.
*/
private static final YamlJsonTranslator DEFAULT_TRANSLATOR =
new YamlJsonTranslator(GsonMessageBodyHandler.configBuilder(new GsonBuilder()).create());
private final YamlJsonTranslator translator;
/**
* Constructs the object.
*/
public YamlMessageBodyHandler() {
this(DEFAULT_TRANSLATOR);
}
/**
* Constructs the object.
*
* @param translator translator to use to translate to/from YAML
*/
public YamlMessageBodyHandler(YamlJsonTranslator translator) {
logger.info("Accepting YAML for REST calls");
this.translator = translator;
}
@Override
public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return canHandle(mediaType);
}
@Override
public long getSize(Object object, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return -1;
}
@Override
public void writeTo(Object object, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException {
try (var writer = new OutputStreamWriter(entityStream, StandardCharsets.UTF_8)) {
translator.toYaml(writer, object);
}
}
@Override
public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return canHandle(mediaType);
}
/**
* Determines if this provider can handle the given media type.
*
* @param mediaType the media type of interest
* @return {@code true} if this provider handles the given media type, {@code false}
* otherwise
*/
private boolean canHandle(MediaType mediaType) {
return (mediaType != null && "yaml".equalsIgnoreCase(mediaType.getSubtype()));
}
@Override
public Object readFrom(Class<Object> type, Type genericType, Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String, String> httpHeaders, InputStream entityStream) throws IOException {
try (var streamReader = new InputStreamReader(entityStream, StandardCharsets.UTF_8)) {
Class<?> clazz = (Class<?>) genericType;
return translator.fromYaml(streamReader, clazz);
} catch (JsonSyntaxException e) {
throw new YAMLException(e);
}
}
}
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