io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.handler.codec.http.websocketx;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelOutboundInvoker;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.EmptyHttpHeaders;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpClientCodec;
import io.netty.handler.codec.http.HttpContentDecompressor;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpObject;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestEncoder;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.HttpResponseDecoder;
import io.netty.handler.codec.http.HttpScheme;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.util.NetUtil;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.internal.ObjectUtil;
import java.net.URI;
import java.nio.channels.ClosedChannelException;
import java.util.Locale;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
/**
* Base class for web socket client handshake implementations
*/
public abstract class WebSocketClientHandshaker {
private static final String HTTP_SCHEME_PREFIX = HttpScheme.HTTP + "://";
private static final String HTTPS_SCHEME_PREFIX = HttpScheme.HTTPS + "://";
protected static final int DEFAULT_FORCE_CLOSE_TIMEOUT_MILLIS = 10000;
private final URI uri;
private final WebSocketVersion version;
private volatile boolean handshakeComplete;
private volatile long forceCloseTimeoutMillis = DEFAULT_FORCE_CLOSE_TIMEOUT_MILLIS;
private volatile int forceCloseInit;
private static final AtomicIntegerFieldUpdater FORCE_CLOSE_INIT_UPDATER =
AtomicIntegerFieldUpdater.newUpdater(WebSocketClientHandshaker.class, "forceCloseInit");
private volatile boolean forceCloseComplete;
private final String expectedSubprotocol;
private volatile String actualSubprotocol;
protected final HttpHeaders customHeaders;
private final int maxFramePayloadLength;
private final boolean absoluteUpgradeUrl;
protected final boolean generateOriginHeader;
/**
* Base constructor
*
* @param uri
* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
* sent to this URL.
* @param version
* Version of web socket specification to use to connect to the server
* @param subprotocol
* Sub protocol request sent to the server.
* @param customHeaders
* Map of custom headers to add to the client request
* @param maxFramePayloadLength
* Maximum length of a frame's payload
*/
protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol,
HttpHeaders customHeaders, int maxFramePayloadLength) {
this(uri, version, subprotocol, customHeaders, maxFramePayloadLength, DEFAULT_FORCE_CLOSE_TIMEOUT_MILLIS);
}
/**
* Base constructor
*
* @param uri
* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
* sent to this URL.
* @param version
* Version of web socket specification to use to connect to the server
* @param subprotocol
* Sub protocol request sent to the server.
* @param customHeaders
* Map of custom headers to add to the client request
* @param maxFramePayloadLength
* Maximum length of a frame's payload
* @param forceCloseTimeoutMillis
* Close the connection if it was not closed by the server after timeout specified
*/
protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol,
HttpHeaders customHeaders, int maxFramePayloadLength,
long forceCloseTimeoutMillis) {
this(uri, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis, false);
}
/**
* Base constructor
*
* @param uri
* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
* sent to this URL.
* @param version
* Version of web socket specification to use to connect to the server
* @param subprotocol
* Sub protocol request sent to the server.
* @param customHeaders
* Map of custom headers to add to the client request
* @param maxFramePayloadLength
* Maximum length of a frame's payload
* @param forceCloseTimeoutMillis
* Close the connection if it was not closed by the server after timeout specified
* @param absoluteUpgradeUrl
* Use an absolute url for the Upgrade request, typically when connecting through an HTTP proxy over
* clear HTTP
*/
protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol,
HttpHeaders customHeaders, int maxFramePayloadLength,
long forceCloseTimeoutMillis, boolean absoluteUpgradeUrl) {
this(uri, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis,
absoluteUpgradeUrl, true);
}
/**
* Base constructor
*
* @param uri
* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
* sent to this URL.
* @param version
* Version of web socket specification to use to connect to the server
* @param subprotocol
* Sub protocol request sent to the server.
* @param customHeaders
* Map of custom headers to add to the client request
* @param maxFramePayloadLength
* Maximum length of a frame's payload
* @param forceCloseTimeoutMillis
* Close the connection if it was not closed by the server after timeout specified
* @param absoluteUpgradeUrl
* Use an absolute url for the Upgrade request, typically when connecting through an HTTP proxy over
* clear HTTP
* @param generateOriginHeader
* Allows to generate the `Origin`|`Sec-WebSocket-Origin` header value for handshake request
* according to the given webSocketURL
*/
protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol,
HttpHeaders customHeaders, int maxFramePayloadLength,
long forceCloseTimeoutMillis, boolean absoluteUpgradeUrl, boolean generateOriginHeader) {
this.uri = uri;
this.version = version;
expectedSubprotocol = subprotocol;
this.customHeaders = customHeaders;
this.maxFramePayloadLength = maxFramePayloadLength;
this.forceCloseTimeoutMillis = forceCloseTimeoutMillis;
this.absoluteUpgradeUrl = absoluteUpgradeUrl;
this.generateOriginHeader = generateOriginHeader;
}
/**
* Returns the URI to the web socket. e.g. "ws://myhost.com/path"
*/
public URI uri() {
return uri;
}
/**
* Version of the web socket specification that is being used
*/
public WebSocketVersion version() {
return version;
}
/**
* Returns the max length for any frame's payload
*/
public int maxFramePayloadLength() {
return maxFramePayloadLength;
}
/**
* Flag to indicate if the opening handshake is complete
*/
public boolean isHandshakeComplete() {
return handshakeComplete;
}
private void setHandshakeComplete() {
handshakeComplete = true;
}
/**
* Returns the CSV of requested subprotocol(s) sent to the server as specified in the constructor
*/
public String expectedSubprotocol() {
return expectedSubprotocol;
}
/**
* Returns the subprotocol response sent by the server. Only available after end of handshake.
* Null if no subprotocol was requested or confirmed by the server.
*/
public String actualSubprotocol() {
return actualSubprotocol;
}
private void setActualSubprotocol(String actualSubprotocol) {
this.actualSubprotocol = actualSubprotocol;
}
public long forceCloseTimeoutMillis() {
return forceCloseTimeoutMillis;
}
/**
* Flag to indicate if the closing handshake was initiated because of timeout.
* For testing only.
*/
protected boolean isForceCloseComplete() {
return forceCloseComplete;
}
/**
* Sets timeout to close the connection if it was not closed by the server.
*
* @param forceCloseTimeoutMillis
* Close the connection if it was not closed by the server after timeout specified
*/
public WebSocketClientHandshaker setForceCloseTimeoutMillis(long forceCloseTimeoutMillis) {
this.forceCloseTimeoutMillis = forceCloseTimeoutMillis;
return this;
}
/**
* Begins the opening handshake
*
* @param channel
* Channel
*/
public ChannelFuture handshake(Channel channel) {
ObjectUtil.checkNotNull(channel, "channel");
return handshake(channel, channel.newPromise());
}
/**
* Begins the opening handshake
*
* @param channel
* Channel
* @param promise
* the {@link ChannelPromise} to be notified when the opening handshake is sent
*/
public final ChannelFuture handshake(Channel channel, final ChannelPromise promise) {
ChannelPipeline pipeline = channel.pipeline();
HttpResponseDecoder decoder = pipeline.get(HttpResponseDecoder.class);
if (decoder == null) {
HttpClientCodec codec = pipeline.get(HttpClientCodec.class);
if (codec == null) {
promise.setFailure(new IllegalStateException("ChannelPipeline does not contain " +
"an HttpResponseDecoder or HttpClientCodec"));
return promise;
}
}
if (uri.getHost() == null) {
if (customHeaders == null || !customHeaders.contains(HttpHeaderNames.HOST)) {
promise.setFailure(new IllegalArgumentException("Cannot generate the 'host' header value," +
" webSocketURI should contain host or passed through customHeaders"));
return promise;
}
if (generateOriginHeader && !customHeaders.contains(HttpHeaderNames.ORIGIN)) {
final String originName;
if (version == WebSocketVersion.V07 || version == WebSocketVersion.V08) {
originName = HttpHeaderNames.SEC_WEBSOCKET_ORIGIN.toString();
} else {
originName = HttpHeaderNames.ORIGIN.toString();
}
promise.setFailure(new IllegalArgumentException("Cannot generate the '" + originName + "' header" +
" value, webSocketURI should contain host or disable generateOriginHeader or pass value" +
" through customHeaders"));
return promise;
}
}
FullHttpRequest request = newHandshakeRequest();
channel.writeAndFlush(request).addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) {
if (future.isSuccess()) {
ChannelPipeline p = future.channel().pipeline();
ChannelHandlerContext ctx = p.context(HttpRequestEncoder.class);
if (ctx == null) {
ctx = p.context(HttpClientCodec.class);
}
if (ctx == null) {
promise.setFailure(new IllegalStateException("ChannelPipeline does not contain " +
"an HttpRequestEncoder or HttpClientCodec"));
return;
}
p.addAfter(ctx.name(), "ws-encoder", newWebSocketEncoder());
promise.setSuccess();
} else {
promise.setFailure(future.cause());
}
}
});
return promise;
}
/**
* Returns a new {@link FullHttpRequest) which will be used for the handshake.
*/
protected abstract FullHttpRequest newHandshakeRequest();
/**
* Validates and finishes the opening handshake initiated by {@link #handshake}}.
*
* @param channel
* Channel
* @param response
* HTTP response containing the closing handshake details
*/
public final void finishHandshake(Channel channel, FullHttpResponse response) {
verify(response);
// Verify the subprotocol that we received from the server.
// This must be one of our expected subprotocols - or null/empty if we didn't want to speak a subprotocol
String receivedProtocol = response.headers().get(HttpHeaderNames.SEC_WEBSOCKET_PROTOCOL);
receivedProtocol = receivedProtocol != null ? receivedProtocol.trim() : null;
String expectedProtocol = expectedSubprotocol != null ? expectedSubprotocol : "";
boolean protocolValid = false;
if (expectedProtocol.isEmpty() && receivedProtocol == null) {
// No subprotocol required and none received
protocolValid = true;
setActualSubprotocol(expectedSubprotocol); // null or "" - we echo what the user requested
} else if (!expectedProtocol.isEmpty() && receivedProtocol != null && !receivedProtocol.isEmpty()) {
// We require a subprotocol and received one -> verify it
for (String protocol : expectedProtocol.split(",")) {
if (protocol.trim().equals(receivedProtocol)) {
protocolValid = true;
setActualSubprotocol(receivedProtocol);
break;
}
}
} // else mixed cases - which are all errors
if (!protocolValid) {
throw new WebSocketClientHandshakeException(String.format(
"Invalid subprotocol. Actual: %s. Expected one of: %s",
receivedProtocol, expectedSubprotocol), response);
}
setHandshakeComplete();
final ChannelPipeline p = channel.pipeline();
// Remove decompressor from pipeline if its in use
HttpContentDecompressor decompressor = p.get(HttpContentDecompressor.class);
if (decompressor != null) {
p.remove(decompressor);
}
// Remove aggregator if present before
HttpObjectAggregator aggregator = p.get(HttpObjectAggregator.class);
if (aggregator != null) {
p.remove(aggregator);
}
ChannelHandlerContext ctx = p.context(HttpResponseDecoder.class);
if (ctx == null) {
ctx = p.context(HttpClientCodec.class);
if (ctx == null) {
throw new IllegalStateException("ChannelPipeline does not contain " +
"an HttpRequestEncoder or HttpClientCodec");
}
final HttpClientCodec codec = (HttpClientCodec) ctx.handler();
// Remove the encoder part of the codec as the user may start writing frames after this method returns.
codec.removeOutboundHandler();
p.addAfter(ctx.name(), "ws-decoder", newWebsocketDecoder());
// Delay the removal of the decoder so the user can setup the pipeline if needed to handle
// WebSocketFrame messages.
// See https://github.com/netty/netty/issues/4533
channel.eventLoop().execute(new Runnable() {
@Override
public void run() {
p.remove(codec);
}
});
} else {
if (p.get(HttpRequestEncoder.class) != null) {
// Remove the encoder part of the codec as the user may start writing frames after this method returns.
p.remove(HttpRequestEncoder.class);
}
final ChannelHandlerContext context = ctx;
p.addAfter(context.name(), "ws-decoder", newWebsocketDecoder());
// Delay the removal of the decoder so the user can setup the pipeline if needed to handle
// WebSocketFrame messages.
// See https://github.com/netty/netty/issues/4533
channel.eventLoop().execute(new Runnable() {
@Override
public void run() {
p.remove(context.handler());
}
});
}
}
/**
* Process the opening handshake initiated by {@link #handshake}}.
*
* @param channel
* Channel
* @param response
* HTTP response containing the closing handshake details
* @return future
* the {@link ChannelFuture} which is notified once the handshake completes.
*/
public final ChannelFuture processHandshake(final Channel channel, HttpResponse response) {
return processHandshake(channel, response, channel.newPromise());
}
/**
* Process the opening handshake initiated by {@link #handshake}}.
*
* @param channel
* Channel
* @param response
* HTTP response containing the closing handshake details
* @param promise
* the {@link ChannelPromise} to notify once the handshake completes.
* @return future
* the {@link ChannelFuture} which is notified once the handshake completes.
*/
public final ChannelFuture processHandshake(final Channel channel, HttpResponse response,
final ChannelPromise promise) {
if (response instanceof FullHttpResponse) {
try {
finishHandshake(channel, (FullHttpResponse) response);
promise.setSuccess();
} catch (Throwable cause) {
promise.setFailure(cause);
}
} else {
ChannelPipeline p = channel.pipeline();
ChannelHandlerContext ctx = p.context(HttpResponseDecoder.class);
if (ctx == null) {
ctx = p.context(HttpClientCodec.class);
if (ctx == null) {
return promise.setFailure(new IllegalStateException("ChannelPipeline does not contain " +
"an HttpResponseDecoder or HttpClientCodec"));
}
}
String aggregatorCtx = ctx.name();
// Content-Length and Transfer-Encoding must not be sent in any response with a status code of 1xx or 204.
if (version == WebSocketVersion.V00) {
// Add aggregator and ensure we feed the HttpResponse so it is aggregated. A limit of 8192 should be
// more then enough for the websockets handshake payload.
aggregatorCtx = "httpAggregator";
p.addAfter(ctx.name(), aggregatorCtx, new HttpObjectAggregator(8192));
}
p.addAfter(aggregatorCtx, "handshaker", new ChannelInboundHandlerAdapter() {
private FullHttpResponse fullHttpResponse;
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
if (msg instanceof HttpObject) {
try {
handleHandshakeResponse(ctx, (HttpObject) msg);
} finally {
ReferenceCountUtil.release(msg);
}
} else {
super.channelRead(ctx, msg);
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
// Remove ourself and fail the handshake promise.
ctx.pipeline().remove(this);
promise.setFailure(cause);
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
try {
// Fail promise if Channel was closed
if (!promise.isDone()) {
promise.tryFailure(new ClosedChannelException());
}
ctx.fireChannelInactive();
} finally {
releaseFullHttpResponse();
}
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
releaseFullHttpResponse();
}
private void handleHandshakeResponse(ChannelHandlerContext ctx, HttpObject response) {
if (response instanceof FullHttpResponse) {
ctx.pipeline().remove(this);
tryFinishHandshake((FullHttpResponse) response);
return;
}
if (response instanceof LastHttpContent) {
assert fullHttpResponse != null;
FullHttpResponse handshakeResponse = fullHttpResponse;
fullHttpResponse = null;
try {
ctx.pipeline().remove(this);
tryFinishHandshake(handshakeResponse);
} finally {
handshakeResponse.release();
}
return;
}
if (response instanceof HttpResponse) {
HttpResponse httpResponse = (HttpResponse) response;
fullHttpResponse = new DefaultFullHttpResponse(httpResponse.protocolVersion(),
httpResponse.status(), Unpooled.EMPTY_BUFFER, httpResponse.headers(),
EmptyHttpHeaders.INSTANCE);
if (httpResponse.decoderResult().isFailure()) {
fullHttpResponse.setDecoderResult(httpResponse.decoderResult());
}
}
}
private void tryFinishHandshake(FullHttpResponse fullHttpResponse) {
try {
finishHandshake(channel, fullHttpResponse);
promise.setSuccess();
} catch (Throwable cause) {
promise.setFailure(cause);
}
}
private void releaseFullHttpResponse() {
if (fullHttpResponse != null) {
fullHttpResponse.release();
fullHttpResponse = null;
}
}
});
try {
ctx.fireChannelRead(ReferenceCountUtil.retain(response));
} catch (Throwable cause) {
promise.setFailure(cause);
}
}
return promise;
}
/**
* Verify the {@link FullHttpResponse} and throws a {@link WebSocketHandshakeException} if something is wrong.
*/
protected abstract void verify(FullHttpResponse response);
/**
* Returns the decoder to use after handshake is complete.
*/
protected abstract WebSocketFrameDecoder newWebsocketDecoder();
/**
* Returns the encoder to use after the handshake is complete.
*/
protected abstract WebSocketFrameEncoder newWebSocketEncoder();
/**
* Performs the closing handshake.
*
* When called from within a {@link ChannelHandler} you most likely want to use
* {@link #close(ChannelHandlerContext, CloseWebSocketFrame)}.
*
* @param channel
* Channel
* @param frame
* Closing Frame that was received
*/
public ChannelFuture close(Channel channel, CloseWebSocketFrame frame) {
ObjectUtil.checkNotNull(channel, "channel");
return close(channel, frame, channel.newPromise());
}
/**
* Performs the closing handshake
*
* When called from within a {@link ChannelHandler} you most likely want to use
* {@link #close(ChannelHandlerContext, CloseWebSocketFrame, ChannelPromise)}.
*
* @param channel
* Channel
* @param frame
* Closing Frame that was received
* @param promise
* the {@link ChannelPromise} to be notified when the closing handshake is done
*/
public ChannelFuture close(Channel channel, CloseWebSocketFrame frame, ChannelPromise promise) {
ObjectUtil.checkNotNull(channel, "channel");
return close0(channel, channel, frame, promise);
}
/**
* Performs the closing handshake
*
* @param ctx
* the {@link ChannelHandlerContext} to use.
* @param frame
* Closing Frame that was received
*/
public ChannelFuture close(ChannelHandlerContext ctx, CloseWebSocketFrame frame) {
ObjectUtil.checkNotNull(ctx, "ctx");
return close(ctx, frame, ctx.newPromise());
}
/**
* Performs the closing handshake
*
* @param ctx
* the {@link ChannelHandlerContext} to use.
* @param frame
* Closing Frame that was received
* @param promise
* the {@link ChannelPromise} to be notified when the closing handshake is done
*/
public ChannelFuture close(ChannelHandlerContext ctx, CloseWebSocketFrame frame, ChannelPromise promise) {
ObjectUtil.checkNotNull(ctx, "ctx");
return close0(ctx, ctx.channel(), frame, promise);
}
private ChannelFuture close0(final ChannelOutboundInvoker invoker, final Channel channel,
CloseWebSocketFrame frame, ChannelPromise promise) {
invoker.writeAndFlush(frame, promise);
final long forceCloseTimeoutMillis = this.forceCloseTimeoutMillis;
final WebSocketClientHandshaker handshaker = this;
if (forceCloseTimeoutMillis <= 0 || !channel.isActive() || forceCloseInit != 0) {
return promise;
}
promise.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) {
// If flush operation failed, there is no reason to expect
// a server to receive CloseFrame. Thus this should be handled
// by the application separately.
// Also, close might be called twice from different threads.
if (future.isSuccess() && channel.isActive() &&
FORCE_CLOSE_INIT_UPDATER.compareAndSet(handshaker, 0, 1)) {
final Future forceCloseFuture = channel.eventLoop().schedule(new Runnable() {
@Override
public void run() {
if (channel.isActive()) {
invoker.close();
forceCloseComplete = true;
}
}
}, forceCloseTimeoutMillis, TimeUnit.MILLISECONDS);
channel.closeFuture().addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
forceCloseFuture.cancel(false);
}
});
}
}
});
return promise;
}
/**
* 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 https://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 https://tools.ietf.org/html/rfc6454#section-6.2
return schemePrefix + NetUtil.toSocketAddressString(host, port);
}
return schemePrefix + host;
}
}