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/*-
* ============LICENSE_START=======================================================
* ONAP Policy Models
* ================================================================================
* 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.models.sim.dmaap.rest;
import jakarta.ws.rs.Consumes;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.MultivaluedMap;
import jakarta.ws.rs.ext.MessageBodyReader;
import jakarta.ws.rs.ext.Provider;
import java.io.BufferedReader;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;
import java.util.LinkedList;
import java.util.List;
import org.apache.commons.io.IOUtils;
/**
* Provider that decodes "application/cambria" messages.
*/
@Provider
@Consumes(CambriaMessageBodyHandler.MEDIA_TYPE_APPLICATION_CAMBRIA)
public class CambriaMessageBodyHandler implements MessageBodyReader<Object> {
public static final String MEDIA_TYPE_APPLICATION_CAMBRIA = "application/cambria";
/**
* Maximum length of a message or partition.
*/
private static final int MAX_LEN = 10000000;
/**
* Maximum digits in a length field.
*/
private static final int MAX_DIGITS = 10;
@Override
public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return (mediaType != null && MEDIA_TYPE_APPLICATION_CAMBRIA.equals(mediaType.toString()));
}
@Override
public List<Object> readFrom(Class<Object> type, Type genericType, Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String, String> httpHeaders, InputStream entityStream) throws IOException {
try (var bufferedReader = new BufferedReader(new InputStreamReader(entityStream, StandardCharsets.UTF_8))) {
List<Object> messages = new LinkedList<>();
String msg;
while ((msg = readMessage(bufferedReader)) != null) {
messages.add(msg);
}
return messages;
}
}
/**
* Reads a message.
*
* @param reader source from which to read
* @return the message that was read, or {@code null} if there are no more messages
* @throws IOException if an error occurs
*/
private String readMessage(Reader reader) throws IOException {
if (!skipWhitespace(reader)) {
return null;
}
int partlen = readLength(reader);
if (partlen > MAX_LEN) {
throw new IOException("invalid partition length");
}
int msglen = readLength(reader);
if (msglen > MAX_LEN) {
throw new IOException("invalid message length");
}
// skip over the partition
reader.skip(partlen);
return readString(reader, msglen);
}
/**
* Skips whitespace.
*
* @param reader source from which to read
* @return {@code true} if there is another character after the whitespace,
* {@code false} if the end of the stream has been reached
* @throws IOException if an error occurs
*/
private boolean skipWhitespace(Reader reader) throws IOException {
int chr;
do {
reader.mark(1);
if ((chr = reader.read()) < 0) {
return false;
}
} while (Character.isWhitespace(chr));
// push the last character back onto the reader
reader.reset();
return true;
}
/**
* Reads a length field, which is a number followed by ".".
*
* @param reader source from which to read
* @return the length, or -1 if EOF has been reached
* @throws IOException if an error occurs
*/
private int readLength(Reader reader) throws IOException {
var bldr = new StringBuilder(MAX_DIGITS);
int chr;
for (var x = 0; x < MAX_DIGITS; ++x) {
if ((chr = reader.read()) < 0) {
throw new EOFException("missing '.' in 'length' field");
}
if (chr == '.') {
String text = bldr.toString().trim();
return (text.isEmpty() ? 0 : Integer.parseInt(text));
}
if (!Character.isDigit(chr)) {
throw new IOException("invalid character in 'length' field");
}
bldr.append((char) chr);
}
throw new IOException("too many digits in 'length' field");
}
/**
* Reads a string.
*
* @param reader source from which to read
* @param len length of the string (i.e., number of characters to read)
* @return the string that was read
* @throws IOException if an error occurs
*/
private String readString(Reader reader, int len) throws IOException {
var buf = new char[len];
IOUtils.readFully(reader, buf);
return new String(buf);
}
}
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