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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2022-2023 Bell Canada. All rights reserved.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.spring.utils;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.lang.reflect.Type;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import org.onap.policy.common.utils.coder.YamlJsonTranslator;
import org.springframework.core.GenericTypeResolver;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.AbstractGenericHttpMessageConverter;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.springframework.lang.Nullable;
/**
* Custom converter to marshal/unmarshall data structured with YAML media type.
*/
public class YamlHttpMessageConverter extends AbstractGenericHttpMessageConverter<Object> {
public static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8;
private static final YamlJsonTranslator TRANSLATOR = new YamlJsonTranslator();
public YamlHttpMessageConverter() {
super(new MediaType("application", "yaml"));
setDefaultCharset(DEFAULT_CHARSET);
}
@Override
public final Object read(Type type, @Nullable Class<?> contextClass, HttpInputMessage inputMessage)
throws IOException {
return readResolved(GenericTypeResolver.resolveType(type, contextClass), inputMessage);
}
@Override
protected final Object readInternal(Class<?> clazz, HttpInputMessage inputMessage) throws IOException {
return readResolved(clazz, inputMessage);
}
private Object readInternal(Type resolvedType, Reader reader) {
Class<?> clazz = (Class<?>) resolvedType;
return TRANSLATOR.fromYaml(reader, clazz);
}
@Override
protected final void writeInternal(Object object, @Nullable Type type, HttpOutputMessage outputMessage)
throws IOException {
try (var writer = getWriter(outputMessage)) {
writeInternal(object, writer);
writer.flush();
} catch (Exception ex) {
throw new HttpMessageNotWritableException("Could not write YAML: " + ex.getMessage(), ex);
}
}
private void writeInternal(Object object, Writer writer) {
TRANSLATOR.toYaml(writer, object);
}
private Object readResolved(Type resolvedType, HttpInputMessage inputMessage) throws IOException {
try (var reader = getReader(inputMessage)) {
return readInternal(resolvedType, reader);
} catch (Exception ex) {
throw new HttpMessageNotReadableException("Could not read YAML: " + ex.getMessage(), ex, inputMessage);
}
}
private static Reader getReader(HttpInputMessage inputMessage) throws IOException {
return new InputStreamReader(inputMessage.getBody(), getCharset(inputMessage.getHeaders()));
}
private static Writer getWriter(HttpOutputMessage outputMessage) throws IOException {
return new OutputStreamWriter(outputMessage.getBody(), getCharset(outputMessage.getHeaders()));
}
private static Charset getCharset(HttpHeaders headers) {
MediaType contentType = headers.getContentType();
Charset charset = (contentType == null ? null : contentType.getCharset());
return (charset != null ? charset : DEFAULT_CHARSET);
}
}
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