1 /*

     2  * Copyright (c) 2016, 2017, 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;

    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.Iterator;

    43 import java.util.List;

    44 import java.util.NoSuchElementException;

    45 import java.util.Objects;

    46 import java.util.concurrent.ConcurrentLinkedQueue;

    47 import java.util.concurrent.Flow;

    48 import java.util.function.Supplier;

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

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

    51 

    52 class RequestPublishers {

    53 

    54     static class ByteArrayPublisher implements HttpRequest.BodyPublisher {

    55         private volatile Flow.Publisher<ByteBuffer> delegate;

    56         private final int length;

    57         private final byte[] content;

    58         private final int offset;

    59         private final int bufSize;

    60 

    61         ByteArrayPublisher(byte[] content) {

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

    63         }

    64 

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

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

    67         }

    68 

    69         /* bufSize exposed for testing purposes */

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

    71             this.content = content;

    72             this.offset = offset;

    73             this.length = length;

    74             this.bufSize = bufSize;

    75         }

    76 

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

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

    79             while (length > 0) {

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

    81                 int max = b.capacity();

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

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

    84                 offset += tocopy;

    85                 length -= tocopy;

    86                 b.flip();

    87                 bufs.add(b);

    88             }

    89             return bufs;

    90         }

    91 

    92         @Override

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

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

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

    96             delegate.subscribe(subscriber);

    97         }

    98 

    99         @Override

   100         public long contentLength() {

   101             return length;

   102         }

   103     }

   104 

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

   106     static class IterablePublisher implements HttpRequest.BodyPublisher {

   107         private volatile Flow.Publisher<ByteBuffer> delegate;

   108         private final Iterable<byte[]> content;

   109         private volatile long contentLength;

   110 

   111         IterablePublisher(Iterable<byte[]> content) {

   112             this.content = content;

   113         }

   114 

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

   116         // the content one at the time.

   117         //

   118         class ByteBufferIterator implements Iterator<ByteBuffer> {

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

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

   121             @Override

   122             public boolean hasNext() {

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

   124             }

   125 

   126             @Override

   127             public ByteBuffer next() {

   128                 ByteBuffer buffer = buffers.poll();

   129                 while (buffer == null) {

   130                     copy();

   131                     buffer = buffers.poll();

   132                 }

   133                 return buffer;

   134             }

   135 

   136             ByteBuffer getBuffer() {

   137                 return Utils.getBuffer();

   138             }

   139 

   140             void copy() {

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

   142                 int length = bytes.length;

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

   144                     // avoid inserting empty buffers, except

   145                     // if that's the last.

   146                     return;

   147                 }

   148                 int offset = 0;

   149                 do {

   150                     ByteBuffer b = getBuffer();

   151                     int max = b.capacity();

   152 

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

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

   155                     offset += tocopy;

   156                     length -= tocopy;

   157                     b.flip();

   158                     buffers.add(b);

   159                 } while (length > 0);

   160             }

   161         }

   162 

   163         public Iterator<ByteBuffer> iterator() {

   164             return new ByteBufferIterator();

   165         }

   166 

   167         @Override

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

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

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

   171             delegate.subscribe(subscriber);

   172         }

   173 

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

   175             long len = 0;

   176             for (byte[] b : bytes) {

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

   178             }

   179             return len;

   180         }

   181 

   182         @Override

   183         public long contentLength() {

   184             if (contentLength == 0) {

   185                 synchronized(this) {

   186                     if (contentLength == 0) {

   187                         contentLength = computeLength(content);

   188                     }

   189                 }

   190             }

   191             return contentLength;

   192         }

   193     }

   194 

   195     static class StringPublisher extends ByteArrayPublisher {

   196         public StringPublisher(String content, Charset charset) {

   197             super(content.getBytes(charset));

   198         }

   199     }

   200 

   201     static class EmptyPublisher implements HttpRequest.BodyPublisher {

   202         private final PseudoPublisher<ByteBuffer> delegate = new PseudoPublisher<>();

   203 

   204         @Override

   205         public long contentLength() {

   206             return 0;

   207         }

   208 

   209         @Override

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

   211             delegate.subscribe(subscriber);

   212         }

   213     }

   214 

   215     static class FilePublisher implements BodyPublisher  {

   216         private final File file;

   217         private volatile AccessControlContext acc;

   218 

   219         FilePublisher(Path name) {

   220             file = name.toFile();

   221         }

   222 

   223         void setAccessControlContext(AccessControlContext acc) {

   224             this.acc = acc;

   225         }

   226 

   227         @Override

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

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

   230                 throw new InternalError(

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

   232 

   233             InputStream is;

   234             try {

   235                 PrivilegedExceptionAction<FileInputStream> pa =

   236                         () -> new FileInputStream(file);

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

   238             } catch (PrivilegedActionException pae) {

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

   240             }

   241             PullPublisher<ByteBuffer> publisher =

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

   243             publisher.subscribe(subscriber);

   244         }

   245 

   246         @Override

   247         public long contentLength() {

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

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

   250             return AccessController.doPrivileged(pa, acc);

   251         }

   252     }

   253 

   254     /**

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

   256      */

   257     static class StreamIterator implements Iterator<ByteBuffer> {

   258         final InputStream is;

   259         final Supplier<? extends ByteBuffer> bufSupplier;

   260         volatile ByteBuffer nextBuffer;

   261         volatile boolean need2Read = true;

   262         volatile boolean haveNext;

   263         volatile Throwable error;

   264 

   265         StreamIterator(InputStream is) {

   266             this(is, Utils::getBuffer);

   267         }

   268 

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

   270             this.is = is;

   271             this.bufSupplier = bufSupplier;

   272         }

   273 

   274         Throwable error() {

   275             return error;

   276         }

   277 

   278         private int read() {

   279             nextBuffer = bufSupplier.get();

   280             nextBuffer.clear();

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

   282             int offset = nextBuffer.arrayOffset();

   283             int cap = nextBuffer.capacity();

   284             try {

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

   286                 if (n == -1) {

   287                     is.close();

   288                     return -1;

   289                 }

   290                 //flip

   291                 nextBuffer.limit(n);

   292                 nextBuffer.position(0);

   293                 return n;

   294             } catch (IOException ex) {

   295                 error = ex;

   296                 return -1;

   297             }

   298         }

   299 

   300         @Override

   301         public synchronized boolean hasNext() {

   302             if (need2Read) {

   303                 haveNext = read() != -1;

   304                 if (haveNext) {

   305                     need2Read = false;

   306                 }

   307                 return haveNext;

   308             }

   309             return haveNext;

   310         }

   311 

   312         @Override

   313         public synchronized ByteBuffer next() {

   314             if (!hasNext()) {

   315                 throw new NoSuchElementException();

   316             }

   317             need2Read = true;

   318             return nextBuffer;

   319         }

   320 

   321     }

   322 

   323     static class InputStreamPublisher implements BodyPublisher {

   324         private final Supplier<? extends InputStream> streamSupplier;

   325 

   326         InputStreamPublisher(Supplier<? extends InputStream> streamSupplier) {

   327             this.streamSupplier = streamSupplier;

   328         }

   329 

   330         @Override

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

   332 

   333             InputStream is = streamSupplier.get();

   334             if (is == null) {

   335                 throw new UncheckedIOException(new IOException("no inputstream supplied"));

   336             }

   337             PullPublisher<ByteBuffer> publisher =

   338                     new PullPublisher<>(iterableOf(is));

   339             publisher.subscribe(subscriber);

   340         }

   341 

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

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

   344         }

   345 

   346         @Override

   347         public long contentLength() {

   348             return -1;

   349         }

   350     }

   351 }