1 /*

     2  * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package jdk.incubator.http.internal;

    27 

    28 import java.io.File;

    29 import java.io.FileInputStream;

    30 import java.io.IOException;

    31 import java.io.InputStream;

    32 import java.io.UncheckedIOException;

    33 import java.nio.ByteBuffer;

    34 import java.nio.charset.Charset;

    35 import java.nio.file.Path;

    36 import java.security.AccessControlContext;

    37 import java.security.AccessController;

    38 import java.security.PrivilegedAction;

    39 import java.security.PrivilegedActionException;

    40 import java.security.PrivilegedExceptionAction;

    41 import java.util.ArrayList;

    42 import java.util.Collections;

    43 import java.util.Iterator;

    44 import java.util.List;

    45 import java.util.NoSuchElementException;

    46 import java.util.Objects;

    47 import java.util.concurrent.ConcurrentLinkedQueue;

    48 import java.util.concurrent.Flow;

    49 import java.util.concurrent.Flow.Publisher;

    50 import java.util.function.Supplier;

    51 import jdk.incubator.http.HttpRequest.BodyPublisher;

    52 import jdk.incubator.http.internal.common.Utils;

    53 

    54 public final class RequestPublishers {

    55 

    56     private RequestPublishers() { }

    57 

    58     public static class ByteArrayPublisher implements BodyPublisher {

    59         private volatile Flow.Publisher<ByteBuffer> delegate;

    60         private final int length;

    61         private final byte[] content;

    62         private final int offset;

    63         private final int bufSize;

    64 

    65         public ByteArrayPublisher(byte[] content) {

    66             this(content, 0, content.length);

    67         }

    68 

    69         public ByteArrayPublisher(byte[] content, int offset, int length) {

    70             this(content, offset, length, Utils.BUFSIZE);

    71         }

    72 

    73         /* bufSize exposed for testing purposes */

    74         ByteArrayPublisher(byte[] content, int offset, int length, int bufSize) {

    75             this.content = content;

    76             this.offset = offset;

    77             this.length = length;

    78             this.bufSize = bufSize;

    79         }

    80 

    81         List<ByteBuffer> copy(byte[] content, int offset, int length) {

    82             List<ByteBuffer> bufs = new ArrayList<>();

    83             while (length > 0) {

    84                 ByteBuffer b = ByteBuffer.allocate(Math.min(bufSize, length));

    85                 int max = b.capacity();

    86                 int tocopy = Math.min(max, length);

    87                 b.put(content, offset, tocopy);

    88                 offset += tocopy;

    89                 length -= tocopy;

    90                 b.flip();

    91                 bufs.add(b);

    92             }

    93             return bufs;

    94         }

    95 

    96         @Override

    97         public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {

    98             List<ByteBuffer> copy = copy(content, offset, length);

    99             this.delegate = new PullPublisher<>(copy);

   100             delegate.subscribe(subscriber);

   101         }

   102 

   103         @Override

   104         public long contentLength() {

   105             return length;

   106         }

   107     }

   108 

   109     // This implementation has lots of room for improvement.

   110     public static class IterablePublisher implements BodyPublisher {

   111         private volatile Flow.Publisher<ByteBuffer> delegate;

   112         private final Iterable<byte[]> content;

   113         private volatile long contentLength;

   114 

   115         public IterablePublisher(Iterable<byte[]> content) {

   116             this.content = Objects.requireNonNull(content);

   117         }

   118 

   119         // The ByteBufferIterator will iterate over the byte[] arrays in

   120         // the content one at the time.

   121         //

   122         class ByteBufferIterator implements Iterator<ByteBuffer> {

   123             final ConcurrentLinkedQueue<ByteBuffer> buffers = new ConcurrentLinkedQueue<>();

   124             final Iterator<byte[]> iterator = content.iterator();

   125             @Override

   126             public boolean hasNext() {

   127                 return !buffers.isEmpty() || iterator.hasNext();

   128             }

   129 

   130             @Override

   131             public ByteBuffer next() {

   132                 ByteBuffer buffer = buffers.poll();

   133                 while (buffer == null) {

   134                     copy();

   135                     buffer = buffers.poll();

   136                 }

   137                 return buffer;

   138             }

   139 

   140             ByteBuffer getBuffer() {

   141                 return Utils.getBuffer();

   142             }

   143 

   144             void copy() {

   145                 byte[] bytes = iterator.next();

   146                 int length = bytes.length;

   147                 if (length == 0 && iterator.hasNext()) {

   148                     // avoid inserting empty buffers, except

   149                     // if that's the last.

   150                     return;

   151                 }

   152                 int offset = 0;

   153                 do {

   154                     ByteBuffer b = getBuffer();

   155                     int max = b.capacity();

   156 

   157                     int tocopy = Math.min(max, length);

   158                     b.put(bytes, offset, tocopy);

   159                     offset += tocopy;

   160                     length -= tocopy;

   161                     b.flip();

   162                     buffers.add(b);

   163                 } while (length > 0);

   164             }

   165         }

   166 

   167         public Iterator<ByteBuffer> iterator() {

   168             return new ByteBufferIterator();

   169         }

   170 

   171         @Override

   172         public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {

   173             Iterable<ByteBuffer> iterable = this::iterator;

   174             this.delegate = new PullPublisher<>(iterable);

   175             delegate.subscribe(subscriber);

   176         }

   177 

   178         static long computeLength(Iterable<byte[]> bytes) {

   179             long len = 0;

   180             for (byte[] b : bytes) {

   181                 len = Math.addExact(len, (long)b.length);

   182             }

   183             return len;

   184         }

   185 

   186         @Override

   187         public long contentLength() {

   188             if (contentLength == 0) {

   189                 synchronized(this) {

   190                     if (contentLength == 0) {

   191                         contentLength = computeLength(content);

   192                     }

   193                 }

   194             }

   195             return contentLength;

   196         }

   197     }

   198 

   199     public static class StringPublisher extends ByteArrayPublisher {

   200         public StringPublisher(String content, Charset charset) {

   201             super(content.getBytes(charset));

   202         }

   203     }

   204 

   205     public static class EmptyPublisher implements BodyPublisher {

   206         private final Flow.Publisher<ByteBuffer> delegate =

   207                 new PullPublisher<ByteBuffer>(Collections.emptyList(), null);

   208 

   209         @Override

   210         public long contentLength() {

   211             return 0;

   212         }

   213 

   214         @Override

   215         public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {

   216             delegate.subscribe(subscriber);

   217         }

   218     }

   219 

   220     public static class FilePublisher implements BodyPublisher  {

   221         private final File file;

   222         private volatile AccessControlContext acc;

   223 

   224         public FilePublisher(Path name) {

   225             file = name.toFile();

   226         }

   227 

   228         void setAccessControlContext(AccessControlContext acc) {

   229             this.acc = acc;

   230         }

   231 

   232         @Override

   233         public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {

   234             if (System.getSecurityManager() != null && acc == null)

   235                 throw new InternalError(

   236                         "Unexpected null acc when security manager has been installed");

   237 

   238             InputStream is;

   239             try {

   240                 PrivilegedExceptionAction<FileInputStream> pa =

   241                         () -> new FileInputStream(file);

   242                 is = AccessController.doPrivileged(pa, acc);

   243             } catch (PrivilegedActionException pae) {

   244                 throw new UncheckedIOException((IOException)pae.getCause());

   245             }

   246             PullPublisher<ByteBuffer> publisher =

   247                     new PullPublisher<>(() -> new StreamIterator(is));

   248             publisher.subscribe(subscriber);

   249         }

   250 

   251         @Override

   252         public long contentLength() {

   253             assert System.getSecurityManager() != null ? acc != null: true;

   254             PrivilegedAction<Long> pa = () -> file.length();

   255             return AccessController.doPrivileged(pa, acc);

   256         }

   257     }

   258 

   259     /**

   260      * Reads one buffer ahead all the time, blocking in hasNext()

   261      */

   262     public static class StreamIterator implements Iterator<ByteBuffer> {

   263         final InputStream is;

   264         final Supplier<? extends ByteBuffer> bufSupplier;

   265         volatile ByteBuffer nextBuffer;

   266         volatile boolean need2Read = true;

   267         volatile boolean haveNext;

   268 

   269         StreamIterator(InputStream is) {

   270             this(is, Utils::getBuffer);

   271         }

   272 

   273         StreamIterator(InputStream is, Supplier<? extends ByteBuffer> bufSupplier) {

   274             this.is = is;

   275             this.bufSupplier = bufSupplier;

   276         }

   277 

   278 //        Throwable error() {

   279 //            return error;

   280 //        }

   281 

   282         private int read() {

   283             nextBuffer = bufSupplier.get();

   284             nextBuffer.clear();

   285             byte[] buf = nextBuffer.array();

   286             int offset = nextBuffer.arrayOffset();

   287             int cap = nextBuffer.capacity();

   288             try {

   289                 int n = is.read(buf, offset, cap);

   290                 if (n == -1) {

   291                     is.close();

   292                     return -1;

   293                 }

   294                 //flip

   295                 nextBuffer.limit(n);

   296                 nextBuffer.position(0);

   297                 return n;

   298             } catch (IOException ex) {

   299                 return -1;

   300             }

   301         }

   302 

   303         @Override

   304         public synchronized boolean hasNext() {

   305             if (need2Read) {

   306                 haveNext = read() != -1;

   307                 if (haveNext) {

   308                     need2Read = false;

   309                 }

   310                 return haveNext;

   311             }

   312             return haveNext;

   313         }

   314 

   315         @Override

   316         public synchronized ByteBuffer next() {

   317             if (!hasNext()) {

   318                 throw new NoSuchElementException();

   319             }

   320             need2Read = true;

   321             return nextBuffer;

   322         }

   323 

   324     }

   325 

   326     public static class InputStreamPublisher implements BodyPublisher {

   327         private final Supplier<? extends InputStream> streamSupplier;

   328 

   329         public InputStreamPublisher(Supplier<? extends InputStream> streamSupplier) {

   330             this.streamSupplier = Objects.requireNonNull(streamSupplier);

   331         }

   332 

   333         @Override

   334         public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {

   335             PullPublisher<ByteBuffer> publisher;

   336             InputStream is = streamSupplier.get();

   337             if (is == null) {

   338                 Throwable t = new IOException("streamSupplier returned null");

   339                 publisher = new PullPublisher<>(null, t);

   340             } else  {

   341                 publisher = new PullPublisher<>(iterableOf(is), null);

   342             }

   343             publisher.subscribe(subscriber);

   344         }

   345 

   346         protected Iterable<ByteBuffer> iterableOf(InputStream is) {

   347             return () -> new StreamIterator(is);

   348         }

   349 

   350         @Override

   351         public long contentLength() {

   352             return -1;

   353         }

   354     }

   355 

   356     public static final class PublisherAdapter implements BodyPublisher {

   357 

   358         private final Publisher<? extends ByteBuffer> publisher;

   359         private final long contentLength;

   360 

   361         public PublisherAdapter(Publisher<? extends ByteBuffer> publisher,

   362                          long contentLength) {

   363             this.publisher = Objects.requireNonNull(publisher);

   364             this.contentLength = contentLength;

   365         }

   366 

   367         @Override

   368         public final long contentLength() {

   369             return contentLength;

   370         }

   371 

   372         @Override

   373         public final void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {

   374             publisher.subscribe(subscriber);

   375         }

   376     }

   377 }