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/*
* Copyright (c) 2012, 2019 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.jersey.message.internal;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
import javax.ws.rs.BadRequestException;
import javax.ws.rs.ProcessingException;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.NoContentException;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.ReaderInterceptor;
import javax.ws.rs.ext.ReaderInterceptorContext;
import org.glassfish.jersey.internal.LocalizationMessages;
import org.glassfish.jersey.internal.PropertiesDelegate;
import org.glassfish.jersey.internal.inject.InjectionManager;
import org.glassfish.jersey.internal.inject.InjectionManagerSupplier;
import org.glassfish.jersey.message.MessageBodyWorkers;
/**
* Represents reader interceptor chain executor for both client and server side.
* It constructs wrapped interceptor chain and invokes it. At the end of the chain
* a {@link MessageBodyReader message body reader} execution interceptor is inserted,
* which finally reads an entity from the output stream provided by the chain.
*
* @author Miroslav Fuksa
* @author Jakub Podlesak
*/
public final class ReaderInterceptorExecutor extends InterceptorExecutor
implements ReaderInterceptorContext, InjectionManagerSupplier {
private static final Logger LOGGER = Logger.getLogger(ReaderInterceptorExecutor.class.getName());
private final MultivaluedMap headers;
private final Iterator interceptors;
private final MessageBodyWorkers workers;
private final boolean translateNce;
private final InjectionManager injectionManager;
private InputStream inputStream;
private int processedCount;
/**
* Constructs a new executor to read given type from provided {@link InputStream entityStream}.
*
* @param rawType raw Java entity type.
* @param type generic Java entity type.
* @param annotations array of annotations on the declaration of the artifact
* that will be initialized with the produced instance. E.g. if the message
* body is to be converted into a method parameter, this will be the annotations
* on that parameter returned by {@code Method.getParameterAnnotations}.
* @param mediaType media type of the HTTP entity.
* @param headers mutable message headers.
* @param propertiesDelegate request-scoped properties delegate.
* @param inputStream entity input stream.
* @param workers {@link org.glassfish.jersey.message.MessageBodyWorkers Message body workers}.
* @param readerInterceptors Reader interceptor that are to be used to intercept the reading of an entity.
* The interceptors will be executed in the same order as given in this parameter.
* @param translateNce if {@code true}, the {@link javax.ws.rs.core.NoContentException} thrown by a selected message
* body
* reader will be translated into a {@link javax.ws.rs.BadRequestException} as required by
* @param injectionManager injection manager.
*/
ReaderInterceptorExecutor(final Class rawType, final Type type,
final Annotation[] annotations,
final MediaType mediaType,
final MultivaluedMap headers,
final PropertiesDelegate propertiesDelegate,
final InputStream inputStream,
final MessageBodyWorkers workers,
final Iterable readerInterceptors,
final boolean translateNce,
final InjectionManager injectionManager) {
super(rawType, type, annotations, mediaType, propertiesDelegate);
this.headers = headers;
this.inputStream = inputStream;
this.workers = workers;
this.translateNce = translateNce;
this.injectionManager = injectionManager;
final List effectiveInterceptors = StreamSupport.stream(readerInterceptors.spliterator(), false)
.collect(Collectors.toList());
effectiveInterceptors.add(new TerminalReaderInterceptor());
this.interceptors = effectiveInterceptors.iterator();
this.processedCount = 0;
}
/**
* Starts the interceptor chain execution.
*
* @return an entity read from the stream.
*/
@Override
@SuppressWarnings("unchecked")
public Object proceed() throws IOException {
if (!interceptors.hasNext()) {
throw new ProcessingException(LocalizationMessages.ERROR_INTERCEPTOR_READER_PROCEED());
}
final ReaderInterceptor interceptor = interceptors.next();
traceBefore(interceptor, MsgTraceEvent.RI_BEFORE);
try {
return interceptor.aroundReadFrom(this);
} finally {
processedCount++;
traceAfter(interceptor, MsgTraceEvent.RI_AFTER);
}
}
@Override
public InputStream getInputStream() {
return this.inputStream;
}
@Override
public void setInputStream(final InputStream is) {
this.inputStream = is;
}
@Override
public MultivaluedMap getHeaders() {
return headers;
}
/**
* Get number of processed interceptors.
*
* @return number of processed interceptors.
*/
int getProcessedCount() {
return processedCount;
}
@Override
public InjectionManager getInjectionManager() {
return injectionManager;
}
/**
* Terminal reader interceptor which choose the appropriate {@link MessageBodyReader}
* and reads the entity from the input stream. The order of actions is the following:
* 1. choose the appropriate {@link MessageBodyReader}
* 3. reads the entity from the output stream
*/
private class TerminalReaderInterceptor implements ReaderInterceptor {
@Override
@SuppressWarnings("unchecked")
public Object aroundReadFrom(final ReaderInterceptorContext context) throws IOException, WebApplicationException {
processedCount--; //this is not regular interceptor -> count down
traceBefore(null, MsgTraceEvent.RI_BEFORE);
try {
final TracingLogger tracingLogger = getTracingLogger();
if (tracingLogger.isLogEnabled(MsgTraceEvent.MBR_FIND)) {
tracingLogger.log(MsgTraceEvent.MBR_FIND,
context.getType().getName(),
(context.getGenericType() instanceof Class
? ((Class) context.getGenericType()).getName() : context.getGenericType()),
String.valueOf(context.getMediaType()), java.util.Arrays.toString(context.getAnnotations()));
}
final MessageBodyReader bodyReader = workers.getMessageBodyReader(
context.getType(),
context.getGenericType(),
context.getAnnotations(),
context.getMediaType(),
ReaderInterceptorExecutor.this);
final EntityInputStream input = new EntityInputStream(context.getInputStream());
if (bodyReader == null) {
if (input.isEmpty() && !context.getHeaders().containsKey(HttpHeaders.CONTENT_TYPE)) {
return null;
} else {
LOGGER.log(Level.FINE, LocalizationMessages.ERROR_NOTFOUND_MESSAGEBODYREADER(context.getMediaType(),
context.getType(), context.getGenericType()));
throw new MessageBodyProviderNotFoundException(LocalizationMessages.ERROR_NOTFOUND_MESSAGEBODYREADER(
context.getMediaType(), context.getType(), context.getGenericType()));
}
}
Object entity = invokeReadFrom(context, bodyReader, input);
if (bodyReader instanceof CompletableReader) {
entity = ((CompletableReader) bodyReader).complete(entity);
}
return entity;
} finally {
clearLastTracedInterceptor();
traceAfter(null, MsgTraceEvent.RI_AFTER);
}
}
@SuppressWarnings("unchecked")
private Object invokeReadFrom(final ReaderInterceptorContext context, final MessageBodyReader reader,
final EntityInputStream input) throws WebApplicationException, IOException {
final TracingLogger tracingLogger = getTracingLogger();
final long timestamp = tracingLogger.timestamp(MsgTraceEvent.MBR_READ_FROM);
final InputStream stream = new UnCloseableInputStream(input, reader);
try {
return reader.readFrom(context.getType(), context.getGenericType(), context.getAnnotations(),
context.getMediaType(), context.getHeaders(), stream);
} catch (final NoContentException ex) {
if (translateNce) {
throw new BadRequestException(ex);
} else {
throw ex;
}
} finally {
tracingLogger.logDuration(MsgTraceEvent.MBR_READ_FROM, timestamp, reader);
}
}
}
/**
* {@link javax.ws.rs.ext.MessageBodyReader}s should not close the given {@link java.io.InputStream stream}. This input
* stream makes sure that the stream is not closed even if MBR tries to do it.
*/
private static class UnCloseableInputStream extends InputStream {
private final InputStream original;
private final MessageBodyReader reader;
private UnCloseableInputStream(final InputStream original, final MessageBodyReader reader) {
this.original = original;
this.reader = reader;
}
@Override
public int read() throws IOException {
return original.read();
}
@Override
public int read(final byte[] b) throws IOException {
return original.read(b);
}
@Override
public int read(final byte[] b, final int off, final int len) throws IOException {
return original.read(b, off, len);
}
@Override
public long skip(final long l) throws IOException {
return original.skip(l);
}
@Override
public int available() throws IOException {
return original.available();
}
@Override
public synchronized void mark(final int i) {
original.mark(i);
}
@Override
public synchronized void reset() throws IOException {
original.reset();
}
@Override
public boolean markSupported() {
return original.markSupported();
}
@Override
public void close() throws IOException {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.log(Level.FINE, LocalizationMessages.MBR_TRYING_TO_CLOSE_STREAM(reader.getClass()));
}
}
private InputStream unwrap() {
return original;
}
}
/**
* Make the {@link InputStream} able to close.
*
* The purpose of this utility method is to undo effect of {@link ReaderInterceptorExecutor.UnCloseableInputStream}.
*
* @param inputStream Potential {@link ReaderInterceptorExecutor.UnCloseableInputStream} to undo its effect
* @return Input stream that is possible to close
*/
public static InputStream closeableInputStream(InputStream inputStream) {
if (inputStream instanceof UnCloseableInputStream) {
return ((UnCloseableInputStream) inputStream).unwrap();
} else {
return inputStream;
}
}
}
