266 lines
9.6 KiB
Java
266 lines
9.6 KiB
Java
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/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.io.IOException;
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import java.io.UncheckedIOException;
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import java.net.InetSocketAddress;
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import java.net.URI;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.channels.ServerSocketChannel;
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import java.nio.channels.SocketChannel;
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import java.nio.charset.CharacterCodingException;
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import java.nio.charset.StandardCharsets;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.util.Arrays;
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import java.util.Base64;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.CompletableFuture;
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import java.util.function.Function;
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import java.util.regex.Pattern;
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import java.util.stream.Collectors;
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import static java.lang.String.format;
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import static java.util.Objects.requireNonNull;
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//
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// Performs a simple opening handshake and yields the channel.
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//
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// Client Request:
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//
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// GET /chat HTTP/1.1
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// Host: server.example.com
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// Upgrade: websocket
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// Connection: Upgrade
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// Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
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// Origin: http://example.com
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// Sec-WebSocket-Protocol: chat, superchat
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// Sec-WebSocket-Version: 13
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//
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//
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// Server Response:
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//
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// HTTP/1.1 101 Switching Protocols
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// Upgrade: websocket
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// Connection: Upgrade
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// Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=
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// Sec-WebSocket-Protocol: chat
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//
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final class HandshakePhase {
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private final ServerSocketChannel ssc;
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HandshakePhase(InetSocketAddress address) {
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requireNonNull(address);
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try {
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ssc = ServerSocketChannel.open();
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ssc.bind(address);
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} catch (IOException e) {
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throw new UncheckedIOException(e);
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}
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}
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//
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// Returned CF completes normally after the handshake has been performed
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//
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CompletableFuture<SocketChannel> afterHandshake(
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Function<List<String>, List<String>> mapping) {
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return CompletableFuture.supplyAsync(
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() -> {
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SocketChannel socketChannel = accept();
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try {
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StringBuilder request = new StringBuilder();
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if (!readRequest(socketChannel, request)) {
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throw new IllegalStateException();
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}
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List<String> strings = Arrays.asList(
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request.toString().split("\r\n")
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);
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List<String> response = mapping.apply(strings);
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writeResponse(socketChannel, response);
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return socketChannel;
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} catch (Throwable t) {
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try {
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socketChannel.close();
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} catch (IOException ignored) { }
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throw t;
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}
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});
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}
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CompletableFuture<SocketChannel> afterHandshake() {
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return afterHandshake((request) -> {
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List<String> response = new LinkedList<>();
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Iterator<String> iterator = request.iterator();
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if (!iterator.hasNext()) {
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throw new IllegalStateException("The request is empty");
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}
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if (!"GET / HTTP/1.1".equals(iterator.next())) {
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throw new IllegalStateException
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("Unexpected status line: " + request.get(0));
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}
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response.add("HTTP/1.1 101 Switching Protocols");
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Map<String, String> requestHeaders = new HashMap<>();
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while (iterator.hasNext()) {
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String header = iterator.next();
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String[] split = header.split(": ");
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if (split.length != 2) {
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throw new IllegalStateException
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("Unexpected header: " + header
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+ ", split=" + Arrays.toString(split));
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}
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if (requestHeaders.put(split[0], split[1]) != null) {
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throw new IllegalStateException
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("Duplicating headers: " + Arrays.toString(split));
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}
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}
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if (requestHeaders.containsKey("Sec-WebSocket-Protocol")) {
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throw new IllegalStateException("Subprotocols are not expected");
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}
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if (requestHeaders.containsKey("Sec-WebSocket-Extensions")) {
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throw new IllegalStateException("Extensions are not expected");
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}
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expectHeader(requestHeaders, "Connection", "Upgrade");
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response.add("Connection: Upgrade");
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expectHeader(requestHeaders, "Upgrade", "websocket");
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response.add("Upgrade: websocket");
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expectHeader(requestHeaders, "Sec-WebSocket-Version", "13");
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String key = requestHeaders.get("Sec-WebSocket-Key");
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if (key == null) {
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throw new IllegalStateException("Sec-WebSocket-Key is missing");
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}
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MessageDigest sha1 = null;
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try {
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sha1 = MessageDigest.getInstance("SHA-1");
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} catch (NoSuchAlgorithmException e) {
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throw new InternalError(e);
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}
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String x = key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
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sha1.update(x.getBytes(StandardCharsets.ISO_8859_1));
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String v = Base64.getEncoder().encodeToString(sha1.digest());
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response.add("Sec-WebSocket-Accept: " + v);
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return response;
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});
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}
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private String expectHeader(Map<String, String> headers,
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String name,
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String value) {
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String v = headers.get(name);
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if (!value.equals(v)) {
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throw new IllegalStateException(
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format("Expected '%s: %s', actual: '%s: %s'",
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name, value, name, v)
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);
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}
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return v;
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}
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URI getURI() {
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InetSocketAddress a;
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try {
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a = (InetSocketAddress) ssc.getLocalAddress();
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} catch (IOException e) {
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throw new UncheckedIOException(e);
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}
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return URI.create("ws://" + a.getHostName() + ":" + a.getPort());
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}
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private int read(SocketChannel socketChannel, ByteBuffer buffer) {
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try {
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int num = socketChannel.read(buffer);
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if (num == -1) {
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throw new IllegalStateException("Unexpected EOF");
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}
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assert socketChannel.isBlocking() && num > 0;
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return num;
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} catch (IOException e) {
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throw new UncheckedIOException(e);
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}
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}
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private SocketChannel accept() {
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SocketChannel socketChannel = null;
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try {
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socketChannel = ssc.accept();
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socketChannel.configureBlocking(true);
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} catch (IOException e) {
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if (socketChannel != null) {
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try {
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socketChannel.close();
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} catch (IOException ignored) { }
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}
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throw new UncheckedIOException(e);
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}
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return socketChannel;
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}
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private boolean readRequest(SocketChannel socketChannel,
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StringBuilder request) {
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ByteBuffer buffer = ByteBuffer.allocateDirect(512);
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read(socketChannel, buffer);
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CharBuffer decoded;
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buffer.flip();
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try {
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decoded =
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StandardCharsets.ISO_8859_1.newDecoder().decode(buffer);
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} catch (CharacterCodingException e) {
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throw new UncheckedIOException(e);
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}
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request.append(decoded);
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return Pattern.compile("\r\n\r\n").matcher(request).find();
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}
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private void writeResponse(SocketChannel socketChannel,
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List<String> response) {
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String s = response.stream().collect(Collectors.joining("\r\n"))
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+ "\r\n\r\n";
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ByteBuffer encoded;
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try {
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encoded =
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StandardCharsets.ISO_8859_1.newEncoder().encode(CharBuffer.wrap(s));
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} catch (CharacterCodingException e) {
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throw new UncheckedIOException(e);
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}
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write(socketChannel, encoded);
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}
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private void write(SocketChannel socketChannel, ByteBuffer buffer) {
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try {
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while (buffer.hasRemaining()) {
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socketChannel.write(buffer);
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}
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} catch (IOException e) {
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try {
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socketChannel.close();
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} catch (IOException ignored) { }
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throw new UncheckedIOException(e);
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}
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}
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}
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