【Spring-Security】Re03 认证参数修改与跨域跳转处理

一、请求参数名设置

之前的表单信息有一些要求：

1、action属性发送的地址是Security设置的URL

2、发送的请求方式是POST

3、请求的账户信息，也就是表单发送的参数，必须对应的是username & password

原因是因为这个过滤器类：

org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter

和下面的方法：

如果要改变默认的请求参数，可以设置：

package cn.zeal4j.configuration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

/**
 * @author Administrator
 * @file IntelliJ IDEA Spring-Security-Tutorial
 * @create 2020 09 27 21:55
 */
@Configuration
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {

    @Bean
    public PasswordEncoder getPasswordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Override
    protected void configure(HttpSecurity httpSecurity) throws Exception {
        httpSecurity.formLogin(). // 设置登陆行为方式为表单登陆
                // 登陆请求参数设置
                usernameParameter("username").
                passwordParameter("password").
                loginPage("/login.html"). // 设置登陆页面URL路径
                loginProcessingUrl("/login.action"). // 设置表单提交URL路径
                successForwardUrl("/main.page"). // 设置认证成功跳转URL路径 POST请求
                failureForwardUrl("/error.page");  // 设置认证失败跳转URL路径 POST请求

        httpSecurity.authorizeRequests().
                antMatchers("/login.html").permitAll(). // 登陆页面允许任意访问
                antMatchers("/error.html").permitAll(). // 失败跳转后重定向的页面也需要被允许访问
                anyRequest().authenticated(); // 其他请求均需要被授权访问

        // CSRF攻击拦截关闭
        httpSecurity.csrf().disable();
    }
}

二、前后端分离登陆成功页的跳转：

问题的产生：

使用默认successForwardUrl并不能用来跳转到外部地址，也就是跨域访问

例如这样设置成功登陆页进行跳转：

successForwardUrl("http://www.baidu.com")

方法分析：

successForwardUrl方法的实现：

public FormLoginConfigurer<H> successForwardUrl(String forwardUrl) {
    this.successHandler(new ForwardAuthenticationSuccessHandler(forwardUrl));
    return this;
}

内部是调用了一个成功处理器方法，并且注入了一个跳转授权成功处理器对象，构造参数又是这个要登录的页面URL

跳转授权成功处理器类：

package org.springframework.security.web.authentication;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.util.UrlUtils;
import org.springframework.util.Assert;

public class ForwardAuthenticationSuccessHandler implements AuthenticationSuccessHandler {
    private final String forwardUrl;

    public ForwardAuthenticationSuccessHandler(String forwardUrl) {
        Assert.isTrue(UrlUtils.isValidRedirectUrl(forwardUrl), () -> {
            return "'" + forwardUrl + "' is not a valid forward URL";
        });
        this.forwardUrl = forwardUrl;
    }

    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException, ServletException {
        request.getRequestDispatcher(this.forwardUrl).forward(request, response);
    }
}

可以看到下面的这个方法是将URL进行转发处理的，所以像跨域处理的是没有办法解决的

这个处理器类是实现了一个接口：

org.springframework.security.web.authentication.AuthenticationSuccessHandler　

接口的方法：

package org.springframework.security.web.authentication;
import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.security.core.Authentication;

public interface AuthenticationSuccessHandler {
    default void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authentication) throws IOException, ServletException {
        this.onAuthenticationSuccess(request, response, authentication);
        chain.doFilter(request, response);
    }

    void onAuthenticationSuccess(HttpServletRequest var1, HttpServletResponse var2, Authentication var3) throws IOException, ServletException;
}

也就是说，我们可以通过自己写一个类实现这个接口，单独处理前后端分离的重定向登陆URL

package cn.zeal4j.handler;

import org.springframework.security.core.Authentication;
import org.springframework.security.web.authentication.AuthenticationSuccessHandler;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author Administrator
 * @file IntelliJ IDEA Spring-Security-Tutorial
 * @create 2020 09 27 23:48
 * 前后端分离url登陆处理 Front and rear separation （FARS）
 */
public class FarsAuthenticationSuccessHandler implements AuthenticationSuccessHandler {

    private String url;

    public FarsAuthenticationSuccessHandler(String url) {
        this.url = url;
    }

    @Override
    public void onAuthenticationSuccess(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Authentication authentication) throws IOException, ServletException {
        httpServletResponse.sendRedirect(url);
    }

//    @Override
//    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authentication) throws IOException, ServletException {
//
//    }
}

改写登陆成功页面URL的方法：

package cn.zeal4j.configuration;

import cn.zeal4j.handler.FarsAuthenticationSuccessHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

/**
 * @author Administrator
 * @file IntelliJ IDEA Spring-Security-Tutorial
 * @create 2020 09 27 21:55
 */
@Configuration
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {

    @Bean
    public PasswordEncoder getPasswordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Override
    protected void configure(HttpSecurity httpSecurity) throws Exception {
        httpSecurity.formLogin(). // 设置登陆行为方式为表单登陆
                // 登陆请求参数设置
                usernameParameter("username").
                passwordParameter("password").
                loginPage("/login.html"). // 设置登陆页面URL路径
                loginProcessingUrl("/login.action"). // 设置表单提交URL路径
                // successForwardUrl("/main.page"). // 设置认证成功跳转URL路径 POST请求
                successHandler(new FarsAuthenticationSuccessHandler("https://www.acfun.cn/")). // 使用自定义的重定向登陆
                failureForwardUrl("/error.page");  // 设置认证失败跳转URL路径 POST请求

        httpSecurity.authorizeRequests().
                antMatchers("/login.html").permitAll(). // 登陆页面允许任意访问
                antMatchers("/error.html").permitAll(). // 失败跳转后重定向的页面也需要被允许访问
                anyRequest().authenticated(); // 其他请求均需要被授权访问

        // CSRF攻击拦截关闭
        httpSecurity.csrf().disable();
    }
}

参数Authentication可以获取登陆账户的信息：

package cn.zeal4j.handler;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.web.authentication.AuthenticationSuccessHandler;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Collection;

/**
 * @author Administrator
 * @file IntelliJ IDEA Spring-Security-Tutorial
 * @create 2020 09 27 23:48
 * 前后端分离url登陆处理 Front and rear separation （FARS）
 */
public class FarsAuthenticationSuccessHandler implements AuthenticationSuccessHandler {

    private String url;

    public FarsAuthenticationSuccessHandler(String url) {
        this.url = url;
    }

    @Override
    public void onAuthenticationSuccess(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Authentication authentication) throws IOException, ServletException {
        
        Object principal = authentication.getPrincipal();
        User user = (User) principal;
        Collection<GrantedAuthority> authorities = user.getAuthorities();
        System.out.println(user.getUsername());
        System.out.println(user.getPassword());
        for (GrantedAuthority authority : authorities) {
            System.out.println(authority.getAuthority());
        }

        httpServletResponse.sendRedirect(url);
    }

//    @Override
//    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authentication) throws IOException, ServletException {
//
//    }
}

打印结果：

admin
null
admin
normal

密码输出NULL是因为Security的保护限制？

三、前后端分离登陆失败页的跳转：

有成功页面的跳转，对应的就有失败页面的跳转

public FormLoginConfigurer<H> failureForwardUrl(String forwardUrl) {
    this.failureHandler(new ForwardAuthenticationFailureHandler(forwardUrl));
    return this;
}

也是同样的方法和类似的对象和相同的注入方式

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//

package org.springframework.security.web.authentication;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.util.UrlUtils;
import org.springframework.util.Assert;

public class ForwardAuthenticationFailureHandler implements AuthenticationFailureHandler {
    private final String forwardUrl;

    public ForwardAuthenticationFailureHandler(String forwardUrl) {
        Assert.isTrue(UrlUtils.isValidRedirectUrl(forwardUrl), () -> {
            return "'" + forwardUrl + "' is not a valid forward URL";
        });
        this.forwardUrl = forwardUrl;
    }

    public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response, AuthenticationException exception) throws IOException, ServletException {
        request.setAttribute("SPRING_SECURITY_LAST_EXCEPTION", exception);
        request.getRequestDispatcher(this.forwardUrl).forward(request, response);
    }
}

所以要实现跨域跳转，一样是实现上面的接口，除了跳转，该方法还要求携带异常对象

自定义实现类

package cn.zeal4j.handler;

import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.authentication.AuthenticationFailureHandler;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author Administrator
 * @file IntelliJ IDEA Spring-Security-Tutorial
 * @create 2020 09 28 3:44
 */
public class FarsAuthenticationFailureHandler implements AuthenticationFailureHandler {

    private String url;

    public FarsAuthenticationFailureHandler(String url) {
        this.url = url;
    }

    @Override
    public void onAuthenticationFailure(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, AuthenticationException e) throws IOException, ServletException {
        // 因为跨域，无法携带异常对象
        httpServletResponse.sendRedirect(url);
    }
}

更改Security跳转配置：

package cn.zeal4j.configuration;

import cn.zeal4j.handler.FarsAuthenticationFailureHandler;
import cn.zeal4j.handler.FarsAuthenticationSuccessHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

/**
 * @author Administrator
 * @file IntelliJ IDEA Spring-Security-Tutorial
 * @create 2020 09 27 21:55
 */
@Configuration
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {

    @Bean
    public PasswordEncoder getPasswordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Override
    protected void configure(HttpSecurity httpSecurity) throws Exception {
        httpSecurity.formLogin(). // 设置登陆行为方式为表单登陆
                // 登陆请求参数设置
                usernameParameter("username").
                passwordParameter("password").
                loginPage("/login.html"). // 设置登陆页面URL路径
                loginProcessingUrl("/login.action"). // 设置表单提交URL路径
                // successForwardUrl("/main.page"). // 设置认证成功跳转URL路径 POST请求
                successHandler(new FarsAuthenticationSuccessHandler("https://www.acfun.cn/")). // 使用自定义的重定向登陆
                // failureForwardUrl("/error.page");  // 设置认证失败跳转URL路径 POST请求
                failureHandler(new FarsAuthenticationFailureHandler("/error.html")); // 跨域处理，不需要跳转了

        httpSecurity.authorizeRequests().
                antMatchers("/login.html").permitAll(). // 登陆页面允许任意访问
                antMatchers("/error.html").permitAll(). // 失败跳转后重定向的页面也需要被允许访问
                anyRequest().authenticated(); // 其他请求均需要被授权访问

        // CSRF攻击拦截关闭
        httpSecurity.csrf().disable();
    }
}

登陆控制器的跳转方法就不需要了

package cn.zeal4j.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @author Administrator
 * @file IntelliJ IDEA Spring-Security-Tutorial
 * @create 2020 09 27 22:35
 */

@Controller
public class LoginController {

    @RequestMapping("main.page")
    public String toMainPage() {
        return "main"; // 模版内的页面不允许重定向，忘了忘了
    }

    @PostMapping("error.page") // 控制器不支持POST请求跳转解析, 需要控制器跳转 Resolved [org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'POST' not supported]
    public String redirectToErrorPage() {
        return "redirect:/error.html"; // 重定向要写/标识 区分模版解析
    }
}