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.Collections;
43 import java.util.Iterator;
44 import java.util.List;
45 import java.util.NoSuchElementException;
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 Flow.Publisher<ByteBuffer> delegate =
203 new PullPublisher<ByteBuffer>(Collections.emptyList(), null);
204
205 @Override
206 public long contentLength() {
207 return 0;
208 }
209
210 @Override
211 public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
212 delegate.subscribe(subscriber);
213 }
214 }
215
216 static class FilePublisher implements BodyPublisher {
217 private final File file;
218 private volatile AccessControlContext acc;
219
220 FilePublisher(Path name) {
221 file = name.toFile();
222 }
223
224 void setAccessControlContext(AccessControlContext acc) {
225 this.acc = acc;
226 }
227
228 @Override
229 public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
230 if (System.getSecurityManager() != null && acc == null)
231 throw new InternalError(
232 "Unexpected null acc when security manager has been installed");
233
234 InputStream is;
235 try {
236 PrivilegedExceptionAction<FileInputStream> pa =
237 () -> new FileInputStream(file);
238 is = AccessController.doPrivileged(pa, acc);
239 } catch (PrivilegedActionException pae) {
240 throw new UncheckedIOException((IOException)pae.getCause());
241 }
242 PullPublisher<ByteBuffer> publisher =
243 new PullPublisher<>(() -> new StreamIterator(is));
244 publisher.subscribe(subscriber);
245 }
246
247 @Override
248 public long contentLength() {
249 assert System.getSecurityManager() != null ? acc != null: true;
250 PrivilegedAction<Long> pa = () -> file.length();
251 return AccessController.doPrivileged(pa, acc);
252 }
253 }
254
255 /**
256 * Reads one buffer ahead all the time, blocking in hasNext()
257 */
258 static class StreamIterator implements Iterator<ByteBuffer> {
259 final InputStream is;
260 final Supplier<? extends ByteBuffer> bufSupplier;
261 volatile ByteBuffer nextBuffer;
262 volatile boolean need2Read = true;
263 volatile boolean haveNext;
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 return -1;
296 }
297 }
298
299 @Override
300 public synchronized boolean hasNext() {
301 if (need2Read) {
302 haveNext = read() != -1;
303 if (haveNext) {
304 need2Read = false;
305 }
306 return haveNext;
307 }
308 return haveNext;
309 }
310
311 @Override
312 public synchronized ByteBuffer next() {
313 if (!hasNext()) {
314 throw new NoSuchElementException();
315 }
316 need2Read = true;
317 return nextBuffer;
318 }
319
320 }
321
322 static class InputStreamPublisher implements BodyPublisher {
323 private final Supplier<? extends InputStream> streamSupplier;
324
325 InputStreamPublisher(Supplier<? extends InputStream> streamSupplier) {
326 this.streamSupplier = streamSupplier;
327 }
328
329 @Override
330 public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) {
331 PullPublisher<ByteBuffer> publisher;
332 InputStream is = streamSupplier.get();
333 if (is == null) {
334 Throwable t = new IOException("streamSupplier returned null");
335 publisher = new PullPublisher<>(null, t);
336 } else {
337 publisher = new PullPublisher<>(iterableOf(is), null);
338 }
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 }