spring security DefaultLogoutPageGeneratingFilter 源码
spring security DefaultLogoutPageGeneratingFilter 代码
文件路径：/web/src/main/java/org/springframework/security/web/authentication/ui/DefaultLogoutPageGeneratingFilter.java
/*
* Copyright 2002-2018 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.authentication.ui;
import java.io.IOException;
import java.util.Collections;
import java.util.Map;
import java.util.function.Function;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.core.log.LogMessage;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
import org.springframework.security.web.util.matcher.RequestMatcher;
import org.springframework.util.Assert;
import org.springframework.web.filter.OncePerRequestFilter;
/**
* Generates a default log out page.
*
* @author Rob Winch
* @since 5.1
*/
public class DefaultLogoutPageGeneratingFilter extends OncePerRequestFilter {
private RequestMatcher matcher = new AntPathRequestMatcher("/logout", "GET");
private Function<HttpServletRequest, Map<String, String>> resolveHiddenInputs = (request) -> Collections.emptyMap();
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
if (this.matcher.matches(request)) {
renderLogout(request, response);
}
else {
if (logger.isTraceEnabled()) {
logger.trace(LogMessage.format("Did not render default logout page since request did not match [%s]",
this.matcher));
}
filterChain.doFilter(request, response);
}
}
private void renderLogout(HttpServletRequest request, HttpServletResponse response) throws IOException {
StringBuilder sb = new StringBuilder();
sb.append("<!DOCTYPE html>\n");
sb.append("<html lang=\"en\">\n");
sb.append(" <head>\n");
sb.append(" <meta charset=\"utf-8\">\n");
sb.append(" <meta name=\"viewport\" content=\"width=device-width, initial-scale=1, shrink-to-fit=no\">\n");
sb.append(" <meta name=\"description\" content=\"\">\n");
sb.append(" <meta name=\"author\" content=\"\">\n");
sb.append(" <title>Confirm Log Out?</title>\n");
sb.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");
sb.append(" <link href=\"https://getbootstrap.com/docs/4.0/examples/signin/signin.css\" "
+ "rel=\"stylesheet\" crossorigin=\"anonymous\"/>\n");
sb.append(" </head>\n");
sb.append(" <body>\n");
sb.append(" <div class=\"container\">\n");
sb.append(" <form class=\"form-signin\" method=\"post\" action=\"" + request.getContextPath()
+ "/logout\">\n");
sb.append(" <h2 class=\"form-signin-heading\">Are you sure you want to log out?</h2>\n");
sb.append(renderHiddenInputs(request)
+ " <button class=\"btn btn-lg btn-primary btn-block\" type=\"submit\">Log Out</button>\n");
sb.append(" </form>\n");
sb.append(" </div>\n");
sb.append(" </body>\n");
sb.append("</html>");
response.setContentType("text/html;charset=UTF-8");
response.getWriter().write(sb.toString());
}
/**
* Sets a Function used to resolve a Map of the hidden inputs where the key is the
* name of the input and the value is the value of the input. Typically this is used
* to resolve the CSRF token.
* @param resolveHiddenInputs the function to resolve the inputs
*/
public void setResolveHiddenInputs(Function<HttpServletRequest, Map<String, String>> resolveHiddenInputs) {
Assert.notNull(resolveHiddenInputs, "resolveHiddenInputs cannot be null");
this.resolveHiddenInputs = resolveHiddenInputs;
}
private String renderHiddenInputs(HttpServletRequest request) {
StringBuilder sb = new StringBuilder();
for (Map.Entry<String, String> input : this.resolveHiddenInputs.apply(request).entrySet()) {
sb.append("<input name=\"");
sb.append(input.getKey());
sb.append("\" type=\"hidden\" value=\"");
sb.append(input.getValue());
sb.append("\" />\n");
}
return sb.toString();
}
}
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