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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2020-2022 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.pdpx.main.rest.serialization;
import com.att.research.xacml.api.Request;
import com.att.research.xacml.api.Response;
import com.att.research.xacml.std.json.JsonRequestTranslator;
import com.att.research.xacml.std.json.JsonResponseTranslator;
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.OutputStream;
import java.io.OutputStreamWriter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;
/**
* Provider that serializes and de-serializes xacml request/response json.
*
* @author Chenfei Gao (cgao@research.att.com)
*/
@Provider
@Consumes(XacmlJsonMessageBodyHandler.APPLICATION_XACML_JSON)
@Produces(XacmlJsonMessageBodyHandler.APPLICATION_XACML_JSON)
public class XacmlJsonMessageBodyHandler implements MessageBodyReader<Request>, MessageBodyWriter<Response> {
public static final String APPLICATION_XACML_JSON = "application/xacml+json";
@Override
public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return canHandle(mediaType, type);
}
@Override
public void writeTo(Response response, 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)) {
writer.write(JsonResponseTranslator.toString(response, true));
} catch (Exception exc) {
throw new IOException("failed to convert a json response to a string");
}
}
@Override
public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return canHandle(mediaType, type);
}
@Override
public Request readFrom(Class<Request> type, Type genericType, Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String, String> httpHeaders, InputStream entityStream) throws IOException {
Request jsonRequest = null;
try {
jsonRequest = JsonRequestTranslator.load(entityStream);
} catch (Exception exc) {
throw new IOException("failed to decode incoming request string to a json request");
}
return jsonRequest;
}
/**
* Determines if this provider can handle the given media type.
* @param mediaType the media type of interest
* @param type the class type of the object to read/write
* @return {@code true} if this provider handles the given media type and class type
* {@code false} otherwise
*/
private boolean canHandle(MediaType mediaType, Class<?> type) {
if (mediaType == null) {
return false;
}
return ("xacml+json".equals(mediaType.getSubtype()))
&& (Request.class.isAssignableFrom(type) || Response.class.isAssignableFrom(type));
}
}
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