spring security LoginPageGeneratingWebFilter 源码
spring security LoginPageGeneratingWebFilter 代码
文件路径：/web/src/main/java/org/springframework/security/web/server/ui/LoginPageGeneratingWebFilter.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 java.util.HashMap;
import java.util.Map;
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.util.Assert;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
import org.springframework.web.util.HtmlUtils;
/**
* Generates a default log in page used for authenticating users.
*
* @author Rob Winch
* @since 5.0
*/
public class LoginPageGeneratingWebFilter implements WebFilter {
private ServerWebExchangeMatcher matcher = ServerWebExchangeMatchers.pathMatchers(HttpMethod.GET, "/login");
private Map<String, String> oauth2AuthenticationUrlToClientName = new HashMap<>();
private boolean formLoginEnabled;
public void setFormLoginEnabled(boolean enabled) {
this.formLoginEnabled = enabled;
}
public void setOauth2AuthenticationUrlToClientName(Map<String, String> oauth2AuthenticationUrlToClientName) {
Assert.notNull(oauth2AuthenticationUrlToClientName, "oauth2AuthenticationUrlToClientName cannot be null");
this.oauth2AuthenticationUrlToClientName = oauth2AuthenticationUrlToClientName;
}
@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(LoginPageGeneratingWebFilter::csrfToken).defaultIfEmpty("").map((csrfTokenHtmlInput) -> {
byte[] bytes = createPage(exchange, csrfTokenHtmlInput);
DataBufferFactory bufferFactory = exchange.getResponse().bufferFactory();
return bufferFactory.wrap(bytes);
});
}
private byte[] createPage(ServerWebExchange exchange, String csrfTokenHtmlInput) {
MultiValueMap<String, String> queryParams = exchange.getRequest().getQueryParams();
String contextPath = exchange.getRequest().getPath().contextPath().value();
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>Please sign in</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(formLogin(queryParams, contextPath, csrfTokenHtmlInput));
page.append(oauth2LoginLinks(queryParams, contextPath, this.oauth2AuthenticationUrlToClientName));
page.append(" </div>\n");
page.append(" </body>\n");
page.append("</html>");
return page.toString().getBytes(Charset.defaultCharset());
}
private String formLogin(MultiValueMap<String, String> queryParams, String contextPath, String csrfTokenHtmlInput) {
if (!this.formLoginEnabled) {
return "";
}
boolean isError = queryParams.containsKey("error");
boolean isLogoutSuccess = queryParams.containsKey("logout");
StringBuilder page = new StringBuilder();
page.append(" <form class=\"form-signin\" method=\"post\" action=\"" + contextPath + "/login\">\n");
page.append(" <h2 class=\"form-signin-heading\">Please sign in</h2>\n");
page.append(createError(isError));
page.append(createLogoutSuccess(isLogoutSuccess));
page.append(" <p>\n");
page.append(" <label for=\"username\" class=\"sr-only\">Username</label>\n");
page.append(" <input type=\"text\" id=\"username\" name=\"username\" "
+ "class=\"form-control\" placeholder=\"Username\" required autofocus>\n");
page.append(" </p>\n" + " <p>\n");
page.append(" <label for=\"password\" class=\"sr-only\">Password</label>\n");
page.append(" <input type=\"password\" id=\"password\" name=\"password\" "
+ "class=\"form-control\" placeholder=\"Password\" required>\n");
page.append(" </p>\n");
page.append(csrfTokenHtmlInput);
page.append(" <button class=\"btn btn-lg btn-primary btn-block\" type=\"submit\">Sign in</button>\n");
page.append(" </form>\n");
return page.toString();
}
private static String oauth2LoginLinks(MultiValueMap<String, String> queryParams, String contextPath,
Map<String, String> oauth2AuthenticationUrlToClientName) {
if (oauth2AuthenticationUrlToClientName.isEmpty()) {
return "";
}
boolean isError = queryParams.containsKey("error");
StringBuilder sb = new StringBuilder();
sb.append("<div class=\"container\"><h2 class=\"form-signin-heading\">Login with OAuth 2.0</h2>");
sb.append(createError(isError));
sb.append("<table class=\"table table-striped\">\n");
for (Map.Entry<String, String> clientAuthenticationUrlToClientName : oauth2AuthenticationUrlToClientName
.entrySet()) {
sb.append(" <tr><td>");
String url = clientAuthenticationUrlToClientName.getKey();
sb.append("<a href=\"").append(contextPath).append(url).append("\">");
String clientName = HtmlUtils.htmlEscape(clientAuthenticationUrlToClientName.getValue());
sb.append(clientName);
sb.append("</a>");
sb.append("</td></tr>\n");
}
sb.append("</table></div>\n");
return sb.toString();
}
private static String csrfToken(CsrfToken token) {
return " <input type=\"hidden\" name=\"" + token.getParameterName() + "\" value=\"" + token.getToken()
+ "\">\n";
}
private static String createError(boolean isError) {
return isError ? "<div class=\"alert alert-danger\" role=\"alert\">Invalid credentials</div>" : "";
}
private static String createLogoutSuccess(boolean isLogoutSuccess) {
return isLogoutSuccess ? "<div class=\"alert alert-success\" role=\"alert\">You have been signed out</div>"
: "";
}
}
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