/
RequestPublishers.java
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/
RequestPublishers.java
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/*
* Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.internal.net.http;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FilePermission;
import java.io.IOException;
import java.io.InputStream;
import java.io.UncheckedIOException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Objects;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.Flow;
import java.util.concurrent.Flow.Publisher;
import java.util.function.Supplier;
import java.net.http.HttpRequest.BodyPublisher;
import jdk.internal.net.http.common.Utils;
public final class RequestPublishers {
private RequestPublishers() { }
public static class ByteArrayPublisher implements BodyPublisher {
private final int length;
private final byte[] content;
private final int offset;
private final int bufSize;
public ByteArrayPublisher(byte[] content) {
this(content, 0, content.length);
}
public ByteArrayPublisher(byte[] content, int offset, int length) {
this(content, offset, length, Utils.BUFSIZE);
}
/* bufSize exposed for testing purposes */
ByteArrayPublisher(byte[] content, int offset, int length, int bufSize) {
this.content = content;
this.offset = offset;
this.length = length;
this.bufSize = bufSize;
}
List<ByteBuffer> copy(byte[] content, int offset, int length) {
List<ByteBuffer> bufs = new ArrayList<>();
while (length > 0) {
ByteBuffer b = ByteBuffer.allocate(Math.min(bufSize, length));
int max = b.capacity();
int tocopy = Math.min(max, length);
b.put(content, offset, tocopy);
offset += tocopy;
length -= tocopy;
b.flip();
bufs.add(b);
}
return bufs;
}
@Override
public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
List<ByteBuffer> copy = copy(content, offset, length);
var delegate = new PullPublisher<>(copy);
delegate.subscribe(subscriber);
}
@Override
public long contentLength() {
return length;
}
}
// This implementation has lots of room for improvement.
public static class IterablePublisher implements BodyPublisher {
private final Iterable<byte[]> content;
private volatile long contentLength;
public IterablePublisher(Iterable<byte[]> content) {
this.content = Objects.requireNonNull(content);
}
// The ByteBufferIterator will iterate over the byte[] arrays in
// the content one at the time.
//
class ByteBufferIterator implements Iterator<ByteBuffer> {
final ConcurrentLinkedQueue<ByteBuffer> buffers = new ConcurrentLinkedQueue<>();
final Iterator<byte[]> iterator = content.iterator();
@Override
public boolean hasNext() {
return !buffers.isEmpty() || iterator.hasNext();
}
@Override
public ByteBuffer next() {
ByteBuffer buffer = buffers.poll();
while (buffer == null) {
copy();
buffer = buffers.poll();
}
return buffer;
}
ByteBuffer getBuffer() {
return Utils.getBuffer();
}
void copy() {
byte[] bytes = iterator.next();
int length = bytes.length;
if (length == 0 && iterator.hasNext()) {
// avoid inserting empty buffers, except
// if that's the last.
return;
}
int offset = 0;
do {
ByteBuffer b = getBuffer();
int max = b.capacity();
int tocopy = Math.min(max, length);
b.put(bytes, offset, tocopy);
offset += tocopy;
length -= tocopy;
b.flip();
buffers.add(b);
} while (length > 0);
}
}
public Iterator<ByteBuffer> iterator() {
return new ByteBufferIterator();
}
@Override
public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
Iterable<ByteBuffer> iterable = this::iterator;
var delegate = new PullPublisher<>(iterable);
delegate.subscribe(subscriber);
}
static long computeLength(Iterable<byte[]> bytes) {
long len = 0;
for (byte[] b : bytes) {
len = Math.addExact(len, (long)b.length);
}
return len;
}
@Override
public long contentLength() {
if (contentLength == 0) {
synchronized(this) {
if (contentLength == 0) {
contentLength = computeLength(content);
}
}
}
return contentLength;
}
}
public static class StringPublisher extends ByteArrayPublisher {
public StringPublisher(String content, Charset charset) {
super(content.getBytes(charset));
}
}
public static class EmptyPublisher implements BodyPublisher {
private final Flow.Publisher<ByteBuffer> delegate =
new PullPublisher<ByteBuffer>(Collections.emptyList(), null);
@Override
public long contentLength() {
return 0;
}
@Override
public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
delegate.subscribe(subscriber);
}
}
/**
* Publishes the content of a given file.
*
* Privileged actions are performed within a limited doPrivileged that only
* asserts the specific, read, file permission that was checked during the
* construction of this FilePublisher.
*/
public static class FilePublisher implements BodyPublisher {
private static final FilePermission[] EMPTY_FILE_PERMISSIONS = new FilePermission[0];
private final File file;
private final FilePermission[] filePermissions;
private static String pathForSecurityCheck(Path path) {
return path.toFile().getPath();
}
/**
* Factory for creating FilePublisher.
*
* Permission checks are performed here before construction of the
* FilePublisher. Permission checking and construction are deliberately
* and tightly co-located.
*/
public static FilePublisher create(Path path) throws FileNotFoundException {
FilePermission filePermission = null;
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
String fn = pathForSecurityCheck(path);
FilePermission readPermission = new FilePermission(fn, "read");
sm.checkPermission(readPermission);
filePermission = readPermission;
}
// existence check must be after permission checks
if (Files.notExists(path))
throw new FileNotFoundException(path + " not found");
return new FilePublisher(path, filePermission);
}
private FilePublisher(Path name, FilePermission filePermission) {
assert filePermission != null ? filePermission.getActions().equals("read") : true;
file = name.toFile();
this.filePermissions = filePermission == null ? EMPTY_FILE_PERMISSIONS
: new FilePermission[] { filePermission };
}
@Override
public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
InputStream is = null;
Throwable t = null;
if (System.getSecurityManager() == null) {
try {
is = new FileInputStream(file);
} catch (IOException ioe) {
t = ioe;
}
} else {
try {
PrivilegedExceptionAction<FileInputStream> pa =
() -> new FileInputStream(file);
is = AccessController.doPrivileged(pa, null, filePermissions);
} catch (PrivilegedActionException pae) {
t = pae.getCause();
}
}
final InputStream fis = is;
PullPublisher<ByteBuffer> publisher;
if (t == null) {
publisher = new PullPublisher<>(() -> new StreamIterator(fis));
} else {
publisher = new PullPublisher<>(null, t);
}
publisher.subscribe(subscriber);
}
@Override
public long contentLength() {
if (System.getSecurityManager() == null) {
return file.length();
} else {
PrivilegedAction<Long> pa = () -> file.length();
return AccessController.doPrivileged(pa, null, filePermissions);
}
}
}
/**
* Reads one buffer ahead all the time, blocking in hasNext()
*/
public static class StreamIterator implements Iterator<ByteBuffer> {
final InputStream is;
final Supplier<? extends ByteBuffer> bufSupplier;
volatile ByteBuffer nextBuffer;
volatile boolean need2Read = true;
volatile boolean haveNext;
StreamIterator(InputStream is) {
this(is, Utils::getBuffer);
}
StreamIterator(InputStream is, Supplier<? extends ByteBuffer> bufSupplier) {
this.is = is;
this.bufSupplier = bufSupplier;
}
// Throwable error() {
// return error;
// }
private int read() {
nextBuffer = bufSupplier.get();
nextBuffer.clear();
byte[] buf = nextBuffer.array();
int offset = nextBuffer.arrayOffset();
int cap = nextBuffer.capacity();
try {
int n = is.read(buf, offset, cap);
if (n == -1) {
is.close();
return -1;
}
//flip
nextBuffer.limit(n);
nextBuffer.position(0);
return n;
} catch (IOException ex) {
return -1;
}
}
@Override
public synchronized boolean hasNext() {
if (need2Read) {
haveNext = read() != -1;
if (haveNext) {
need2Read = false;
}
return haveNext;
}
return haveNext;
}
@Override
public synchronized ByteBuffer next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
need2Read = true;
return nextBuffer;
}
}
public static class InputStreamPublisher implements BodyPublisher {
private final Supplier<? extends InputStream> streamSupplier;
public InputStreamPublisher(Supplier<? extends InputStream> streamSupplier) {
this.streamSupplier = Objects.requireNonNull(streamSupplier);
}
@Override
public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
PullPublisher<ByteBuffer> publisher;
InputStream is = streamSupplier.get();
if (is == null) {
Throwable t = new IOException("streamSupplier returned null");
publisher = new PullPublisher<>(null, t);
} else {
publisher = new PullPublisher<>(iterableOf(is), null);
}
publisher.subscribe(subscriber);
}
protected Iterable<ByteBuffer> iterableOf(InputStream is) {
return () -> new StreamIterator(is);
}
@Override
public long contentLength() {
return -1;
}
}
public static final class PublisherAdapter implements BodyPublisher {
private final Publisher<? extends ByteBuffer> publisher;
private final long contentLength;
public PublisherAdapter(Publisher<? extends ByteBuffer> publisher,
long contentLength) {
this.publisher = Objects.requireNonNull(publisher);
this.contentLength = contentLength;
}
@Override
public final long contentLength() {
return contentLength;
}
@Override
public final void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
publisher.subscribe(subscriber);
}
}
}