spring security LogoutPageGeneratingWebFilter 源码
spring security LogoutPageGeneratingWebFilter 代码
文件路径：/web/src/main/java/org/springframework/security/web/server/ui/LogoutPageGeneratingWebFilter.java
/*
* Copyright 2002-2017 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.ui;
import java.nio.charset.Charset;
import reactor.core.publisher.Mono;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.security.web.server.csrf.CsrfToken;
import org.springframework.security.web.server.util.matcher.ServerWebExchangeMatcher;
import org.springframework.security.web.server.util.matcher.ServerWebExchangeMatchers;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
/**
* Generates a default log out page.
*
* @author Rob Winch
* @since 5.0
*/
public class LogoutPageGeneratingWebFilter implements WebFilter {
private ServerWebExchangeMatcher matcher = ServerWebExchangeMatchers.pathMatchers(HttpMethod.GET, "/logout");
@Override
public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
return this.matcher.matches(exchange).filter(ServerWebExchangeMatcher.MatchResult::isMatch)
.switchIfEmpty(chain.filter(exchange).then(Mono.empty())).flatMap((matchResult) -> render(exchange));
}
private Mono<Void> render(ServerWebExchange exchange) {
ServerHttpResponse result = exchange.getResponse();
result.setStatusCode(HttpStatus.OK);
result.getHeaders().setContentType(MediaType.TEXT_HTML);
return result.writeWith(createBuffer(exchange));
}
private Mono<DataBuffer> createBuffer(ServerWebExchange exchange) {
Mono<CsrfToken> token = exchange.getAttributeOrDefault(CsrfToken.class.getName(), Mono.empty());
return token.map(LogoutPageGeneratingWebFilter::csrfToken).defaultIfEmpty("").map((csrfTokenHtmlInput) -> {
byte[] bytes = createPage(csrfTokenHtmlInput);
DataBufferFactory bufferFactory = exchange.getResponse().bufferFactory();
return bufferFactory.wrap(bytes);
});
}
private static byte[] createPage(String csrfTokenHtmlInput) {
StringBuilder page = new StringBuilder();
page.append("<!DOCTYPE html>\n");
page.append("<html lang=\"en\">\n");
page.append(" <head>\n");
page.append(" <meta charset=\"utf-8\">\n");
page.append(" <meta name=\"viewport\" content=\"width=device-width, initial-scale=1, shrink-to-fit=no\">\n");
page.append(" <meta name=\"description\" content=\"\">\n");
page.append(" <meta name=\"author\" content=\"\">\n");
page.append(" <title>Confirm Log Out?</title>\n");
page.append(" <link href=\"https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css\" "
+ "rel=\"stylesheet\" integrity=\"sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M\" crossorigin=\"anonymous\">\n");
page.append(" <link href=\"https://getbootstrap.com/docs/4.0/examples/signin/signin.css\" "
+ "rel=\"stylesheet\" crossorigin=\"anonymous\"/>\n");
page.append(" </head>\n");
page.append(" <body>\n");
page.append(" <div class=\"container\">\n");
page.append(" <form class=\"form-signin\" method=\"post\" action=\"/logout\">\n");
page.append(" <h2 class=\"form-signin-heading\">Are you sure you want to log out?</h2>\n");
page.append(csrfTokenHtmlInput);
page.append(" <button class=\"btn btn-lg btn-primary btn-block\" type=\"submit\">Log Out</button>\n");
page.append(" </form>\n");
page.append(" </div>\n");
page.append(" </body>\n");
page.append("</html>");
return page.toString().getBytes(Charset.defaultCharset());
}
private static String csrfToken(CsrfToken token) {
return " <input type=\"hidden\" name=\"" + token.getParameterName() + "\" value=\"" + token.getToken()
+ "\">\n";
}
}
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