org.springframework.security.web.server.header.StaticServerHttpHeadersWriter Maven / Gradle / Ivy
/*
* Copyright 2002-2021 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.security.web.server.header;
import java.util.Arrays;
import reactor.core.publisher.Mono;
import org.springframework.http.HttpHeaders;
import org.springframework.web.server.ServerWebExchange;
/**
* Allows specifying {@link HttpHeaders} that should be written to the response.
*
* @author Rob Winch
* @since 5.0
*/
public class StaticServerHttpHeadersWriter implements ServerHttpHeadersWriter {
private final HttpHeaders headersToAdd;
public StaticServerHttpHeadersWriter(HttpHeaders headersToAdd) {
this.headersToAdd = headersToAdd;
}
@Override
public Mono writeHttpHeaders(ServerWebExchange exchange) {
HttpHeaders headers = exchange.getResponse().getHeaders();
// Note: We need to ensure that the following algorithm compares headers
// case insensitively, which should be true of headers.containsKey().
boolean containsNoHeadersToAdd = true;
for (String headerName : this.headersToAdd.keySet()) {
if (headers.containsKey(headerName)) {
containsNoHeadersToAdd = false;
break;
}
}
if (containsNoHeadersToAdd) {
this.headersToAdd.forEach(headers::put);
}
return Mono.empty();
}
public static Builder builder() {
return new Builder();
}
public static class Builder {
private HttpHeaders headers = new HttpHeaders();
public Builder header(String headerName, String... values) {
this.headers.put(headerName, Arrays.asList(values));
return this;
}
public StaticServerHttpHeadersWriter build() {
return new StaticServerHttpHeadersWriter(this.headers);
}
}
}