604 lines
23 KiB
Java
604 lines
23 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.http.websocketx;
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import static java.util.Objects.requireNonNull;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelPipeline;
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import io.netty.channel.ChannelPromise;
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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.handler.codec.http.FullHttpRequest;
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import io.netty.handler.codec.http.FullHttpResponse;
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import io.netty.handler.codec.http.HttpClientCodec;
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import io.netty.handler.codec.http.HttpContentDecompressor;
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import io.netty.handler.codec.http.HttpHeaderNames;
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import io.netty.handler.codec.http.HttpHeaders;
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import io.netty.handler.codec.http.HttpObjectAggregator;
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import io.netty.handler.codec.http.HttpRequestEncoder;
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import io.netty.handler.codec.http.HttpResponse;
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import io.netty.handler.codec.http.HttpResponseDecoder;
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import io.netty.handler.codec.http.HttpScheme;
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import io.netty.util.NetUtil;
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import io.netty.util.ReferenceCountUtil;
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import java.net.URI;
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import java.nio.channels.ClosedChannelException;
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import java.util.Locale;
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import java.util.concurrent.Future;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
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/**
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* Base class for web socket client handshake implementations
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*/
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public abstract class WebSocketClientHandshaker {
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private static final String HTTP_SCHEME_PREFIX = HttpScheme.HTTP + "://";
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private static final String HTTPS_SCHEME_PREFIX = HttpScheme.HTTPS + "://";
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protected static final int DEFAULT_FORCE_CLOSE_TIMEOUT_MILLIS = 10000;
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private final URI uri;
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private final WebSocketVersion version;
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private volatile boolean handshakeComplete;
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private volatile long forceCloseTimeoutMillis = DEFAULT_FORCE_CLOSE_TIMEOUT_MILLIS;
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private volatile int forceCloseInit;
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private static final AtomicIntegerFieldUpdater<WebSocketClientHandshaker> FORCE_CLOSE_INIT_UPDATER =
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AtomicIntegerFieldUpdater.newUpdater(WebSocketClientHandshaker.class, "forceCloseInit");
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private volatile boolean forceCloseComplete;
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private final String expectedSubprotocol;
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private volatile String actualSubprotocol;
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protected final HttpHeaders customHeaders;
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private final int maxFramePayloadLength;
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private final boolean absoluteUpgradeUrl;
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/**
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* Base constructor
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*
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* @param uri
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* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
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* sent to this URL.
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* @param version
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* Version of web socket specification to use to connect to the server
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* @param subprotocol
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* Sub protocol request sent to the server.
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* @param customHeaders
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* Map of custom headers to add to the client request
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* @param maxFramePayloadLength
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* Maximum length of a frame's payload
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*/
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protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol,
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HttpHeaders customHeaders, int maxFramePayloadLength) {
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this(uri, version, subprotocol, customHeaders, maxFramePayloadLength, DEFAULT_FORCE_CLOSE_TIMEOUT_MILLIS);
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}
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/**
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* Base constructor
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*
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* @param uri
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* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
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* sent to this URL.
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* @param version
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* Version of web socket specification to use to connect to the server
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* @param subprotocol
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* Sub protocol request sent to the server.
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* @param customHeaders
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* Map of custom headers to add to the client request
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* @param maxFramePayloadLength
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* Maximum length of a frame's payload
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* @param forceCloseTimeoutMillis
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* Close the connection if it was not closed by the server after timeout specified
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*/
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protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol,
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HttpHeaders customHeaders, int maxFramePayloadLength,
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long forceCloseTimeoutMillis) {
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this(uri, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis, false);
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}
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/**
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* Base constructor
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*
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* @param uri
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* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
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* sent to this URL.
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* @param version
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* Version of web socket specification to use to connect to the server
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* @param subprotocol
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* Sub protocol request sent to the server.
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* @param customHeaders
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* Map of custom headers to add to the client request
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* @param maxFramePayloadLength
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* Maximum length of a frame's payload
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* @param forceCloseTimeoutMillis
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* Close the connection if it was not closed by the server after timeout specified
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* @param absoluteUpgradeUrl
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* Use an absolute url for the Upgrade request, typically when connecting through an HTTP proxy over
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* clear HTTP
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*/
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protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol,
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HttpHeaders customHeaders, int maxFramePayloadLength,
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long forceCloseTimeoutMillis, boolean absoluteUpgradeUrl) {
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this.uri = uri;
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this.version = version;
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expectedSubprotocol = subprotocol;
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this.customHeaders = customHeaders;
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this.maxFramePayloadLength = maxFramePayloadLength;
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this.forceCloseTimeoutMillis = forceCloseTimeoutMillis;
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this.absoluteUpgradeUrl = absoluteUpgradeUrl;
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}
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/**
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* Returns the URI to the web socket. e.g. "ws://myhost.com/path"
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*/
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public URI uri() {
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return uri;
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}
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/**
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* Version of the web socket specification that is being used
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*/
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public WebSocketVersion version() {
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return version;
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}
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/**
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* Returns the max length for any frame's payload
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*/
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public int maxFramePayloadLength() {
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return maxFramePayloadLength;
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}
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/**
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* Flag to indicate if the opening handshake is complete
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*/
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public boolean isHandshakeComplete() {
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return handshakeComplete;
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}
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private void setHandshakeComplete() {
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handshakeComplete = true;
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}
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/**
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* Returns the CSV of requested subprotocol(s) sent to the server as specified in the constructor
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*/
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public String expectedSubprotocol() {
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return expectedSubprotocol;
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}
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/**
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* Returns the subprotocol response sent by the server. Only available after end of handshake.
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* Null if no subprotocol was requested or confirmed by the server.
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*/
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public String actualSubprotocol() {
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return actualSubprotocol;
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}
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private void setActualSubprotocol(String actualSubprotocol) {
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this.actualSubprotocol = actualSubprotocol;
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}
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public long forceCloseTimeoutMillis() {
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return forceCloseTimeoutMillis;
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}
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/**
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* Flag to indicate if the closing handshake was initiated because of timeout.
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* For testing only.
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*/
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protected boolean isForceCloseComplete() {
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return forceCloseComplete;
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}
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/**
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* Sets timeout to close the connection if it was not closed by the server.
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*
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* @param forceCloseTimeoutMillis
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* Close the connection if it was not closed by the server after timeout specified
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*/
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public WebSocketClientHandshaker setForceCloseTimeoutMillis(long forceCloseTimeoutMillis) {
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this.forceCloseTimeoutMillis = forceCloseTimeoutMillis;
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return this;
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}
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/**
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* Begins the opening handshake
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*
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* @param channel
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* Channel
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*/
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public ChannelFuture handshake(Channel channel) {
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requireNonNull(channel, "channel");
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return handshake(channel, channel.newPromise());
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}
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/**
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* Begins the opening handshake
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*
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* @param channel
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* Channel
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* @param promise
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* the {@link ChannelPromise} to be notified when the opening handshake is sent
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*/
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public final ChannelFuture handshake(Channel channel, final ChannelPromise promise) {
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ChannelPipeline pipeline = channel.pipeline();
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HttpResponseDecoder decoder = pipeline.get(HttpResponseDecoder.class);
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if (decoder == null) {
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HttpClientCodec codec = pipeline.get(HttpClientCodec.class);
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if (codec == null) {
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promise.setFailure(new IllegalStateException("ChannelPipeline does not contain " +
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"an HttpResponseDecoder or HttpClientCodec"));
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return promise;
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}
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}
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FullHttpRequest request = newHandshakeRequest();
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channel.writeAndFlush(request).addListener((ChannelFutureListener) future -> {
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if (future.isSuccess()) {
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ChannelPipeline p = future.channel().pipeline();
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ChannelHandlerContext ctx = p.context(HttpRequestEncoder.class);
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if (ctx == null) {
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ctx = p.context(HttpClientCodec.class);
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}
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if (ctx == null) {
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promise.setFailure(new IllegalStateException("ChannelPipeline does not contain " +
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"an HttpRequestEncoder or HttpClientCodec"));
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return;
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}
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p.addAfter(ctx.name(), "ws-encoder", newWebSocketEncoder());
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promise.setSuccess();
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} else {
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promise.setFailure(future.cause());
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}
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});
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return promise;
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}
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/**
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* Returns a new {@link FullHttpRequest) which will be used for the handshake.
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*/
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protected abstract FullHttpRequest newHandshakeRequest();
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/**
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* Validates and finishes the opening handshake initiated by {@link #handshake}}.
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*
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* @param channel
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* Channel
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* @param response
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* HTTP response containing the closing handshake details
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*/
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public final void finishHandshake(Channel channel, FullHttpResponse response) {
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verify(response);
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// Verify the subprotocol that we received from the server.
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// This must be one of our expected subprotocols - or null/empty if we didn't want to speak a subprotocol
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String receivedProtocol = response.headers().get(HttpHeaderNames.SEC_WEBSOCKET_PROTOCOL);
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receivedProtocol = receivedProtocol != null ? receivedProtocol.trim() : null;
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String expectedProtocol = expectedSubprotocol != null ? expectedSubprotocol : "";
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boolean protocolValid = false;
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if (expectedProtocol.isEmpty() && receivedProtocol == null) {
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// No subprotocol required and none received
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protocolValid = true;
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setActualSubprotocol(expectedSubprotocol); // null or "" - we echo what the user requested
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} else if (!expectedProtocol.isEmpty() && receivedProtocol != null && !receivedProtocol.isEmpty()) {
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// We require a subprotocol and received one -> verify it
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for (String protocol : expectedProtocol.split(",")) {
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if (protocol.trim().equals(receivedProtocol)) {
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protocolValid = true;
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setActualSubprotocol(receivedProtocol);
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break;
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}
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}
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} // else mixed cases - which are all errors
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if (!protocolValid) {
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throw new WebSocketHandshakeException(String.format(
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"Invalid subprotocol. Actual: %s. Expected one of: %s",
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receivedProtocol, expectedSubprotocol));
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}
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setHandshakeComplete();
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final ChannelPipeline p = channel.pipeline();
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// Remove decompressor from pipeline if its in use
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HttpContentDecompressor decompressor = p.get(HttpContentDecompressor.class);
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if (decompressor != null) {
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p.remove(decompressor);
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}
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// Remove aggregator if present before
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HttpObjectAggregator aggregator = p.get(HttpObjectAggregator.class);
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if (aggregator != null) {
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p.remove(aggregator);
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}
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ChannelHandlerContext ctx = p.context(HttpResponseDecoder.class);
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if (ctx == null) {
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ctx = p.context(HttpClientCodec.class);
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if (ctx == null) {
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throw new IllegalStateException("ChannelPipeline does not contain " +
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"an HttpRequestEncoder or HttpClientCodec");
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}
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final HttpClientCodec codec = (HttpClientCodec) ctx.handler();
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// Remove the encoder part of the codec as the user may start writing frames after this method returns.
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codec.removeOutboundHandler();
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p.addAfter(ctx.name(), "ws-decoder", newWebsocketDecoder());
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// Delay the removal of the decoder so the user can setup the pipeline if needed to handle
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// WebSocketFrame messages.
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// See https://github.com/netty/netty/issues/4533
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channel.eventLoop().execute(() -> p.remove(codec));
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} else {
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if (p.get(HttpRequestEncoder.class) != null) {
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// Remove the encoder part of the codec as the user may start writing frames after this method returns.
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p.remove(HttpRequestEncoder.class);
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}
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final ChannelHandlerContext context = ctx;
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p.addAfter(context.name(), "ws-decoder", newWebsocketDecoder());
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// Delay the removal of the decoder so the user can setup the pipeline if needed to handle
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// WebSocketFrame messages.
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// See https://github.com/netty/netty/issues/4533
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channel.eventLoop().execute(() -> p.remove(context.handler()));
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}
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}
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/**
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* Process the opening handshake initiated by {@link #handshake}}.
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*
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* @param channel
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* Channel
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* @param response
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* HTTP response containing the closing handshake details
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* @return future
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* the {@link ChannelFuture}Â which is notified once the handshake completes.
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*/
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public final ChannelFuture processHandshake(final Channel channel, HttpResponse response) {
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return processHandshake(channel, response, channel.newPromise());
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}
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/**
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* Process the opening handshake initiated by {@link #handshake}}.
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*
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* @param channel
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* Channel
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* @param response
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* HTTP response containing the closing handshake details
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* @param promise
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* the {@link ChannelPromise} to notify once the handshake completes.
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* @return future
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* the {@link ChannelFuture}Â which is notified once the handshake completes.
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*/
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public final ChannelFuture processHandshake(final Channel channel, HttpResponse response,
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final ChannelPromise promise) {
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if (response instanceof FullHttpResponse) {
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try {
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finishHandshake(channel, (FullHttpResponse) response);
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promise.setSuccess();
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} catch (Throwable cause) {
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promise.setFailure(cause);
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}
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} else {
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ChannelPipeline p = channel.pipeline();
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ChannelHandlerContext ctx = p.context(HttpResponseDecoder.class);
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if (ctx == null) {
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ctx = p.context(HttpClientCodec.class);
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if (ctx == null) {
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return promise.setFailure(new IllegalStateException("ChannelPipeline does not contain " +
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"an HttpResponseDecoder or HttpClientCodec"));
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}
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}
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// Add aggregator and ensure we feed the HttpResponse so it is aggregated. A limit of 8192 should be more
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// then enough for the websockets handshake payload.
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//
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// TODO: Make handshake work without HttpObjectAggregator at all.
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String aggregatorName = "httpAggregator";
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p.addAfter(ctx.name(), aggregatorName, new HttpObjectAggregator(8192));
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p.addAfter(aggregatorName, "handshaker", new SimpleChannelInboundHandler<FullHttpResponse>() {
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@Override
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protected void messageReceived(ChannelHandlerContext ctx, FullHttpResponse msg) throws Exception {
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// Remove ourself and do the actual handshake
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ctx.pipeline().remove(this);
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try {
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finishHandshake(channel, msg);
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promise.setSuccess();
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} catch (Throwable cause) {
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promise.setFailure(cause);
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}
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
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// Remove ourself and fail the handshake promise.
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ctx.pipeline().remove(this);
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promise.setFailure(cause);
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}
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@Override
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public void channelInactive(ChannelHandlerContext ctx) throws Exception {
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// Fail promise if Channel was closed
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if (!promise.isDone()) {
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promise.tryFailure(new ClosedChannelException());
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}
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ctx.fireChannelInactive();
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}
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});
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try {
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ctx.fireChannelRead(ReferenceCountUtil.retain(response));
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} catch (Throwable cause) {
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promise.setFailure(cause);
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}
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}
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return promise;
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}
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/**
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* Verify the {@link FullHttpResponse} and throws a {@link WebSocketHandshakeException} if something is wrong.
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*/
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protected abstract void verify(FullHttpResponse response);
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/**
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* Returns the decoder to use after handshake is complete.
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*/
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protected abstract WebSocketFrameDecoder newWebsocketDecoder();
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/**
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* Returns the encoder to use after the handshake is complete.
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*/
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protected abstract WebSocketFrameEncoder newWebSocketEncoder();
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/**
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* Performs the closing handshake
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*
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* @param channel
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* Channel
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* @param frame
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* Closing Frame that was received
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*/
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public ChannelFuture close(Channel channel, CloseWebSocketFrame frame) {
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requireNonNull(channel, "channel");
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return close(channel, frame, channel.newPromise());
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}
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/**
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* Performs the closing handshake
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*
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* @param channel
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* Channel
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* @param frame
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* Closing Frame that was received
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* @param promise
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* the {@link ChannelPromise} to be notified when the closing handshake is done
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*/
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public ChannelFuture close(Channel channel, CloseWebSocketFrame frame, ChannelPromise promise) {
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requireNonNull(channel, "channel");
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channel.writeAndFlush(frame, promise);
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applyForceCloseTimeout(channel, promise);
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return promise;
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}
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private void applyForceCloseTimeout(final Channel channel, ChannelFuture flushFuture) {
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final long forceCloseTimeoutMillis = this.forceCloseTimeoutMillis;
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final WebSocketClientHandshaker handshaker = this;
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if (forceCloseTimeoutMillis <= 0 || !channel.isActive() || forceCloseInit != 0) {
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return;
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}
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flushFuture.addListener(future -> {
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// If flush operation failed, there is no reason to expect
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// a server to receive CloseFrame. Thus this should be handled
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// by the application separately.
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// Also, close might be called twice from different threads.
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if (future.isSuccess() && channel.isActive() &&
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FORCE_CLOSE_INIT_UPDATER.compareAndSet(handshaker, 0, 1)) {
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final Future<?> forceCloseFuture = channel.eventLoop().schedule(() -> {
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if (channel.isActive()) {
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channel.close();
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forceCloseComplete = true;
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}
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}, forceCloseTimeoutMillis, TimeUnit.MILLISECONDS);
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|
||
channel.closeFuture().addListener(ignore -> {
|
||
forceCloseFuture.cancel(false);
|
||
});
|
||
}
|
||
});
|
||
}
|
||
|
||
/**
|
||
* Return the constructed raw path for the give {@link URI}.
|
||
*/
|
||
protected String upgradeUrl(URI wsURL) {
|
||
if (absoluteUpgradeUrl) {
|
||
return wsURL.toString();
|
||
}
|
||
|
||
String path = wsURL.getRawPath();
|
||
path = path == null || path.isEmpty() ? "/" : path;
|
||
String query = wsURL.getRawQuery();
|
||
return query != null && !query.isEmpty() ? path + '?' + query : path;
|
||
}
|
||
|
||
static CharSequence websocketHostValue(URI wsURL) {
|
||
int port = wsURL.getPort();
|
||
if (port == -1) {
|
||
return wsURL.getHost();
|
||
}
|
||
String host = wsURL.getHost();
|
||
String scheme = wsURL.getScheme();
|
||
if (port == HttpScheme.HTTP.port()) {
|
||
return HttpScheme.HTTP.name().contentEquals(scheme)
|
||
|| WebSocketScheme.WS.name().contentEquals(scheme) ?
|
||
host : NetUtil.toSocketAddressString(host, port);
|
||
}
|
||
if (port == HttpScheme.HTTPS.port()) {
|
||
return HttpScheme.HTTPS.name().contentEquals(scheme)
|
||
|| WebSocketScheme.WSS.name().contentEquals(scheme) ?
|
||
host : NetUtil.toSocketAddressString(host, port);
|
||
}
|
||
|
||
// if the port is not standard (80/443) its needed to add the port to the header.
|
||
// See http://tools.ietf.org/html/rfc6454#section-6.2
|
||
return NetUtil.toSocketAddressString(host, port);
|
||
}
|
||
|
||
static CharSequence websocketOriginValue(URI wsURL) {
|
||
String scheme = wsURL.getScheme();
|
||
final String schemePrefix;
|
||
int port = wsURL.getPort();
|
||
final int defaultPort;
|
||
if (WebSocketScheme.WSS.name().contentEquals(scheme)
|
||
|| HttpScheme.HTTPS.name().contentEquals(scheme)
|
||
|| (scheme == null && port == WebSocketScheme.WSS.port())) {
|
||
|
||
schemePrefix = HTTPS_SCHEME_PREFIX;
|
||
defaultPort = WebSocketScheme.WSS.port();
|
||
} else {
|
||
schemePrefix = HTTP_SCHEME_PREFIX;
|
||
defaultPort = WebSocketScheme.WS.port();
|
||
}
|
||
|
||
// Convert uri-host to lower case (by RFC 6454, chapter 4 "Origin of a URI")
|
||
String host = wsURL.getHost().toLowerCase(Locale.US);
|
||
|
||
if (port != defaultPort && port != -1) {
|
||
// if the port is not standard (80/443) its needed to add the port to the header.
|
||
// See http://tools.ietf.org/html/rfc6454#section-6.2
|
||
return schemePrefix + NetUtil.toSocketAddressString(host, port);
|
||
}
|
||
return schemePrefix + host;
|
||
}
|
||
}
|