Spring Security自定义认证器

在了解过Security的认证器后，如果想自定义登陆，只要实现AuthenticationProvider还有对应的Authentication就可以了

Authentication

首先要创建一个自定义的Authentication，Security提供了一个Authentication的子类AbstractAuthenticationToken

我们实现这个类可以了，他已经实现了Authentication的一些方法

public class NamePassAuthenticationToken extends AbstractAuthenticationToken {

    private static final long serialVersionUID = 520L;
    private final Object principal;
    private Object credentials;

//提供第一次进来的构造方法
    public NamePassAuthenticationToken(Object principal, Object credentials) {
        super((Collection)null);
        this.principal = principal;
        this.credentials = credentials;
        this.setAuthenticated(false);
    }

//提供填充Authentication的构造方法
    public NamePassAuthenticationToken(Object principal, Object credentials, Collection<? extends GrantedAuthority> authorities) {
        super(authorities);
        this.principal = principal;
        this.credentials = credentials;
        super.setAuthenticated(true);
    }

    @Override
    public Object getCredentials() {
        return this.credentials;
    }

    @Override
    public Object getPrincipal() {
        return this.principal;
    }

    @Override
    public void setAuthenticated(boolean isAuthenticated) throws IllegalArgumentException {
        if (isAuthenticated) {
            throw new IllegalArgumentException("Cannot set this token to trusted - use constructor which takes a GrantedAuthority list instead");
        } else {
            super.setAuthenticated(false);
        }
    }

    @Override
    public void eraseCredentials() {
        super.eraseCredentials();
        this.credentials = null;
    }
}

这个类关键就是一个是认证的，一个没认证的的构造器

AuthenticationProvider

接着是AuthenticationProvider，需要实现他的authenticate方法

@Setter
public class NamePassAuthenticationProvider implements AuthenticationProvider {

    private CustomUserDetailsService userDetailsService;

    private PasswordEncoder passwordEncoder;

    @Override
    //具体认证逻辑
    public Authentication authenticate(Authentication authentication) {
        NamePassAuthenticationToken authenticationToken = (NamePassAuthenticationToken) authentication;
        String username = (String) authenticationToken.getPrincipal();
        String password = (String) authenticationToken.getCredentials();
        //让具体认证类去认证
        UserDetails user = userDetailsService.loadUserByUsername(username);
        boolean matches = passwordEncoder.matches(password, user.getPassword());
        if (!matches) {
            ResMsg.throwException(AuthExceptionGroup.AUTH_ERROR);
        }
        //填充Authentication
        NamePassAuthenticationToken authenticationResult = new NamePassAuthenticationToken(user, password, user.getAuthorities());
        authenticationResult.setDetails(authenticationToken.getDetails());
        return authenticationResult;
    }

    @Override
    //指定具体的Authentication
    //根据你指定的Authentication来找到具体的Provider
    public boolean supports(Class<?> authentication) {
        return NamePassAuthenticationToken.class.isAssignableFrom(authentication);
    }
}

SecurityConfigurerAdapter

接着就是填充配置了

@Component
public class NamePassAuthenticationSecurityConfig extends SecurityConfigurerAdapter<DefaultSecurityFilterChain, HttpSecurity> {

    @Autowired
    private CustomUserDetailsService customUserDetailsService;

    @Autowired
    private PasswordEncoder passwordEncoder;

    @Override
    public void configure(HttpSecurity http) {
        //phonePass provider
        NamePassAuthenticationProvider provider = new NamePassAuthenticationProvider();
        provider.setUserDetailsService(customUserDetailsService);
        provider.setPasswordEncoder(passwordEncoder);
        http.authenticationProvider(provider);
    }
}

接下来就是导入配置了

通常都会有一个实现了WebSecurityConfigurerAdapter的配置类

把配置类注入进来

@Autowired
private NamePassAuthenticationSecurityConfig namePassAuthenticationSecurityConfig; 

protected void configure(HttpSecurity http) throws Exception {
  http.apply(namePassAuthenticationSecurityConfig);
}

UserDetailsService

UserDetailsService是具体的认证实现类

这个类就非常熟悉了，只需要实现他的loadUserByUsername方法，就可以实现认证了

@Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        AuthmsViewAccount account = accountService.getAccount(username);
        if(account == null) {
            ResMsg.throwException(AUTH_ERROR);
        }

        if (account.getStatus() != 1) {
            ResMsg.throwException(ACCOUNT_HAS_BANED);
        }

        String spliceStaffInfo = String.format("%d-%s",account.getAccountId(),account.getUsername());
//只要Collection<? extends GrantedAuthority> authorities
//这个参数不为空，就表明认证通过，所以空集合也可以通过
        return new User(spliceStaffInfo,account.getPassword(), AuthorityUtils.NO_AUTHORITIES);
    }

把认证结果填充到上下文中

TokenFilter

如果结合了Token，那么需要从token中识别该用户

@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {

    String bearerToken = resolveToken(request);

    if (bearerToken != null && !"".equals(bearerToken.trim()) && SecurityContextHolder.getContext().getAuthentication() == null) {
        //从redis中获取该用户
        NamePassAuthenticationToken namePassAuthenticationToken = authRedisHelper.get(bearerToken);
        if(namePassAuthenticationToken != null) {
            //将信息保存到上下文中
 SecurityContextHolder.getContext().setAuthentication(namePassAuthenticationToken);
        }
    }

    chain.doFilter(request, response);
}

private String resolveToken(HttpServletRequest request) {
        String bearerToken = request.getHeader("Authorization");
        if (StringUtils.hasText(bearerToken) && bearerToken.startsWith(TOKEN_PREFIX)) {
            return bearerToken.substring(7);
        }
        return null;
    }

public NamePassAuthenticationToken get(String bearerToken){
    String spliceStaffInfo = (String)redisRepository.get(formatKey(bearerToken));
    if(spliceStaffInfo == null) {
        return null;
    }
    return new NamePassAuthenticationToken(new AuthStaff(spliceStaffInfo),null,AuthorityUtils.NO_AUTHORITIES);
}

登录过程

在登录的时候，就需要用到这个自定义的认证器了

// 通过用户名和密码创建一个 Authentication 认证对象，实现类为 NamePassAuthenticationToken
NamePassAuthenticationToken authenticationToken = new NamePassAuthenticationToken(user.getUsername(), user.getPassword());

//通过 AuthenticationManager（默认实现为ProviderManager）的authenticate方法验证 Authentication 对象
//AuthenticationManager会通过你传入的authenticationToken来找到具体的Provider
Authentication authentication = authenticationManager.authenticate(authenticationToken);
//填充用户信息到secrity中的user里
User principal = (User) authentication.getPrincipal();
//获取认证后的信息
NamePassAuthenticationToken namePassAuthenticationToken = new NamePassAuthenticationToken(new AuthStaff(principal.getUsername()), null, authentication.getAuthorities());
// 生成token
String bearerToken = IdUtil.fastSimpleUUID();
// 加载到reids
authRedisHelper.set(bearerToken, namePassAuthenticationToken);

这样就实现了自定义的认证器了