Spring Security6 用户身份认证

前提

1.  你需要先拜读 [Spring Security 6 官方文档](https://docs.spring.io/spring-security/reference/servlet/authentication/architecture.html#servlet-authentication-authenticationmanager)
2.  你需要弄清楚身份认证（Authentication）和鉴权（Authorization）是两个概念，其中本文只涉及身份认证

身份认证需要做哪些事情

1. 要弄清楚每次请求，客户端的具体身份是谁
2. 根据不同的接口类型，启用不同的认证机制

Show me your code

• 添加 POM.xml

"1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0modelVersion>
	<parent>
		<groupId>org.springframework.bootgroupId>
		<artifactId>spring-boot-starter-parentartifactId>
		<version>3.1.5version>
		<relativePath/> 
	parent>
	<groupId>com.examplegroupId>
	<artifactId>demoartifactId>
	<version>0.0.1-SNAPSHOTversion>
	<name>demoname>
	<description>Demo project for Spring Bootdescription>
	<properties>
		<java.version>21java.version>
	properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.bootgroupId>
			<artifactId>spring-boot-starter-securityartifactId>
		dependency>
		<dependency>
			<groupId>org.springframework.bootgroupId>
			<artifactId>spring-boot-starter-webartifactId>
		dependency>
 
		<dependency>
			<groupId>org.springframework.bootgroupId>
			<artifactId>spring-boot-starter-testartifactId>
			<scope>testscope>
		dependency>
		<dependency>
			<groupId>org.springframework.securitygroupId>
			<artifactId>spring-security-testartifactId>
			<scope>testscope>
		dependency>
	dependencies>
 
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.bootgroupId>
				<artifactId>spring-boot-maven-pluginartifactId>
				<configuration>
					<image>
						<builder>paketobuildpacks/builder-jammy-base:latestbuilder>
					image>
				configuration>
			plugin>
		plugins>
	build>
 
project>

• 自定义过滤器

/**
 * 
 */
package com.example.demo;
 
import java.io.IOException;
 
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.InternalAuthenticationServiceException;
import org.springframework.security.authentication.ProviderManager;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter;
import org.springframework.security.web.util.matcher.RequestMatcher;
 
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
 
/**
 * 
 */
public class AuthenticationBuilderFilter extends AbstractAuthenticationProcessingFilter {
 
	
	protected AuthenticationBuilderFilter() {
		super(new RequestMatcher() {
			@Override
			public boolean matches(HttpServletRequest request) {
				return true;
			}
		});
		super.setAuthenticationManager(new ProviderManager(new WebAuthenticationProvider()));
	}
 
	@Override
	public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response)
			throws AuthenticationException, IOException, ServletException {
		Authentication auth = new WebAuthentication(request);
		return getAuthenticationManager().authenticate(auth);
	}
 
	@Override
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) res;
		if (!requiresAuthentication(request, response)) {
			chain.doFilter(request, response);
			return;
		}
		try {
			Authentication authenticationResult = attemptAuthentication(request, response);
			if (authenticationResult == null) {
				throw new BadCredentialsException("没有身份信息");
			}
			SecurityContextHolder.getContext().setAuthentication(authenticationResult);
			chain.doFilter(request, response);
		}
		catch (InternalAuthenticationServiceException failed) {
			this.logger.error("An internal error occurred while trying to authenticate the user.", failed);
			unsuccessfulAuthentication(request, response, failed);
		}
		catch (AuthenticationException ex) {
			// Authentication failed
			unsuccessfulAuthentication(request, response, ex);
		}
	}
 
 
}

这里有几个地方需要注意（敲黑板啦~~）

1. 第 37 行，可以根据需要，添加多个provider
2. 第 43 行，后续可以根据实际需要，构建不同的 Authentication ，框架会根据 Authentication 的类型，选择认证 provider（这个是精髓）

• 自定义 Authentication —— WebAuthentication，可以在构造函数内自己根据需要（比如从 requestHeader、cookie等地方，获取 token）组装 Authentication

/**
 * 
 */
package com.example.demo;
 
import java.util.Collection;
 
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
 
import jakarta.servlet.http.HttpServletRequest;
 
/**
 * 
 */
public class WebAuthentication implements Authentication{
	
	public WebAuthentication() {
		
	}
	
	public WebAuthentication(HttpServletRequest request) {
		
	}
 
	/**
	 * 
	 */
	private static final long serialVersionUID = -1705541938861263059L;
 
	@Override
	public String getName() {
		return null;
	}
 
	@Override
	public Collectionextends GrantedAuthority> getAuthorities() {
		return null;
	}
 
	@Override
	public Object getCredentials() {
		return null;
	}
 
	@Override
	public Object getDetails() {
		return null;
	}
 
	@Override
	public Object getPrincipal() {
		return null;
	}
 
	@Override
	public boolean isAuthenticated() {
		return false;
	}
 
	@Override
	public void setAuthenticated(boolean isAuthenticated) throws IllegalArgumentException {
		
	}
}

• 写认证逻辑 ，下面例子认证逻辑被我简化了，大家根据实际需要进行补充

/**
 * 
 */
package com.example.demo;
 
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
 
/**
 * 
 */
public class WebAuthenticationProvider implements AuthenticationProvider {
 
	@Override
	public Authentication authenticate(Authentication authentication) throws AuthenticationException {
		authentication.setAuthenticated(true);
		return authentication;
	}
 
	@Override
	public boolean supports(Class authentication) {
		return authentication.equals(WebAuthentication.class);
	}
 
}

• 配置过滤链

/**
 * 
 */
package com.example.demo;
 
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.web.SecurityFilterChain;
import org.springframework.security.web.csrf.CsrfFilter;
 
/**
 * 
 */
@Configuration
public class SecurityConfig {
	
    @Bean
    SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http
                .csrf(csrf ->csrf.disable())
                .addFilterAfter(new AuthenticationBuilderFilter(), CsrfFilter.class)
                ;
        return http.build();
    }
}