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/*
* Copyright 2002-2023 the original author or authors.
*
* Licensed 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 org.springframework.web.socket;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.BiConsumer;
import org.springframework.http.HttpHeaders;
import org.springframework.lang.Nullable;
import org.springframework.util.CollectionUtils;
/**
* An {@link org.springframework.http.HttpHeaders} variant that adds support for
* the HTTP headers defined by the WebSocket specification RFC 6455.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public class WebSocketHttpHeaders extends HttpHeaders {
public static final String SEC_WEBSOCKET_ACCEPT = "Sec-WebSocket-Accept";
public static final String SEC_WEBSOCKET_EXTENSIONS = "Sec-WebSocket-Extensions";
public static final String SEC_WEBSOCKET_KEY = "Sec-WebSocket-Key";
public static final String SEC_WEBSOCKET_PROTOCOL = "Sec-WebSocket-Protocol";
public static final String SEC_WEBSOCKET_VERSION = "Sec-WebSocket-Version";
private static final long serialVersionUID = -6644521016187828916L;
private final HttpHeaders headers;
/**
* Create a new instance.
*/
public WebSocketHttpHeaders() {
this(new HttpHeaders());
}
/**
* Create an instance that wraps the given pre-existing HttpHeaders and also
* propagate all changes to it.
* @param headers the HTTP headers to wrap
*/
public WebSocketHttpHeaders(HttpHeaders headers) {
this.headers = headers;
}
/**
* Sets the (new) value of the {@code Sec-WebSocket-Accept} header.
* @param secWebSocketAccept the value of the header
*/
public void setSecWebSocketAccept(@Nullable String secWebSocketAccept) {
set(SEC_WEBSOCKET_ACCEPT, secWebSocketAccept);
}
/**
* Returns the value of the {@code Sec-WebSocket-Accept} header.
* @return the value of the header
*/
@Nullable
public String getSecWebSocketAccept() {
return getFirst(SEC_WEBSOCKET_ACCEPT);
}
/**
* Returns the value of the {@code Sec-WebSocket-Extensions} header.
* @return the value of the header
*/
public List getSecWebSocketExtensions() {
List values = get(SEC_WEBSOCKET_EXTENSIONS);
if (CollectionUtils.isEmpty(values)) {
return Collections.emptyList();
}
else {
List result = new ArrayList<>(values.size());
for (String value : values) {
result.addAll(WebSocketExtension.parseExtensions(value));
}
return result;
}
}
/**
* Sets the (new) value(s) of the {@code Sec-WebSocket-Extensions} header.
* @param extensions the values for the header
*/
public void setSecWebSocketExtensions(List extensions) {
List result = new ArrayList<>(extensions.size());
for (WebSocketExtension extension : extensions) {
result.add(extension.toString());
}
set(SEC_WEBSOCKET_EXTENSIONS, toCommaDelimitedString(result));
}
/**
* Sets the (new) value of the {@code Sec-WebSocket-Key} header.
* @param secWebSocketKey the value of the header
*/
public void setSecWebSocketKey(@Nullable String secWebSocketKey) {
set(SEC_WEBSOCKET_KEY, secWebSocketKey);
}
/**
* Returns the value of the {@code Sec-WebSocket-Key} header.
* @return the value of the header
*/
@Nullable
public String getSecWebSocketKey() {
return getFirst(SEC_WEBSOCKET_KEY);
}
/**
* Sets the (new) value of the {@code Sec-WebSocket-Protocol} header.
* @param secWebSocketProtocol the value of the header
*/
public void setSecWebSocketProtocol(String secWebSocketProtocol) {
set(SEC_WEBSOCKET_PROTOCOL, secWebSocketProtocol);
}
/**
* Sets the (new) value of the {@code Sec-WebSocket-Protocol} header.
* @param secWebSocketProtocols the value of the header
*/
public void setSecWebSocketProtocol(List secWebSocketProtocols) {
set(SEC_WEBSOCKET_PROTOCOL, toCommaDelimitedString(secWebSocketProtocols));
}
/**
* Returns the value of the {@code Sec-WebSocket-Key} header.
* @return the value of the header
*/
public List getSecWebSocketProtocol() {
List values = get(SEC_WEBSOCKET_PROTOCOL);
if (CollectionUtils.isEmpty(values)) {
return Collections.emptyList();
}
else if (values.size() == 1) {
return getValuesAsList(SEC_WEBSOCKET_PROTOCOL);
}
else {
return values;
}
}
/**
* Sets the (new) value of the {@code Sec-WebSocket-Version} header.
* @param secWebSocketVersion the value of the header
*/
public void setSecWebSocketVersion(@Nullable String secWebSocketVersion) {
set(SEC_WEBSOCKET_VERSION, secWebSocketVersion);
}
/**
* Returns the value of the {@code Sec-WebSocket-Version} header.
* @return the value of the header
*/
@Nullable
public String getSecWebSocketVersion() {
return getFirst(SEC_WEBSOCKET_VERSION);
}
// Single string methods
/**
* Return the first header value for the given header name, if any.
* @param headerName the header name
* @return the first header value; or {@code null}
*/
@Override
@Nullable
public String getFirst(String headerName) {
return this.headers.getFirst(headerName);
}
/**
* Add the given, single header value under the given name.
* @param headerName the header name
* @param headerValue the header value
* @throws UnsupportedOperationException if adding headers is not supported
* @see #put(String, List)
* @see #set(String, String)
*/
@Override
public void add(String headerName, @Nullable String headerValue) {
this.headers.add(headerName, headerValue);
}
/**
* Set the given, single header value under the given name.
* @param headerName the header name
* @param headerValue the header value
* @throws UnsupportedOperationException if adding headers is not supported
* @see #put(String, List)
* @see #add(String, String)
*/
@Override
public void set(String headerName, @Nullable String headerValue) {
this.headers.set(headerName, headerValue);
}
@Override
public void setAll(Map values) {
this.headers.setAll(values);
}
@Override
public Map toSingleValueMap() {
return this.headers.toSingleValueMap();
}
// Map implementation
@Override
public int size() {
return this.headers.size();
}
@Override
public boolean isEmpty() {
return this.headers.isEmpty();
}
@Override
public boolean containsKey(Object key) {
return this.headers.containsKey(key);
}
@Override
public boolean containsValue(Object value) {
return this.headers.containsValue(value);
}
@Override
@Nullable
public List get(Object key) {
return this.headers.get(key);
}
@Override
public List put(String key, List value) {
return this.headers.put(key, value);
}
@Override
public List remove(Object key) {
return this.headers.remove(key);
}
@Override
public void putAll(Map> m) {
this.headers.putAll(m);
}
@Override
public void clear() {
this.headers.clear();
}
@Override
public Set keySet() {
return this.headers.keySet();
}
@Override
public Collection> values() {
return this.headers.values();
}
@Override
public Set>> entrySet() {
return this.headers.entrySet();
}
@Override
public void forEach(BiConsumer> action) {
this.headers.forEach(action);
}
@Override
public List putIfAbsent(String key, List value) {
return this.headers.putIfAbsent(key, value);
}
@Override
public boolean equals(@Nullable Object other) {
return (this == other || (other instanceof WebSocketHttpHeaders that &&
this.headers.equals(that.headers)));
}
@Override
public int hashCode() {
return this.headers.hashCode();
}
@Override
public String toString() {
return this.headers.toString();
}
}