spring security 重写密码比对类DaoAuthenticationProvider_重写daoauthenticationprovider

1.需求

前端使用了RSA加密密码，到后端时，需要先解密，然后进行对比。

2.DaoAuthenticationProvider介绍

Spring security 获取用户信息并进行密码验证，使用的是 DaoAuthenticationProvider。

Spring Security默认的密码比对主要是依靠DaoAuthenticationProvider下的additionalAuthenticationChecks方法来完成的

下面是源码：

    protected void additionalAuthenticationChecks(UserDetails userDetails, UsernamePasswordAuthenticationToken authentication) throws AuthenticationException {
        if (authentication.getCredentials() == null) {
            this.logger.debug("Authentication failed: no credentials provided");
            throw new BadCredentialsException(this.messages.getMessage("AbstractUserDetailsAuthenticationProvider.badCredentials", "Bad credentials"));
        } else {
            String presentedPassword = authentication.getCredentials().toString();
            if (!this.passwordEncoder.matches(presentedPassword, userDetails.getPassword())) {
                this.logger.debug("Authentication failed: password does not match stored value");
                throw new BadCredentialsException(this.messages.getMessage("AbstractUserDetailsAuthenticationProvider.badCredentials", "Bad credentials"));
            }
        }
    }
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我们只需要将additionalAuthenticationChecks方法进行重写，就可以自定义密码比对业务了。

由于前台传入的是经过RSA 加密过的密码，但是数据库里面存入的又是将明文加密过的密码，所以就不能再使用Spring Security默认的密码比对方式，必须在比

对之前，先将加密的密码进行解密。

public class MyAuthenticationProvider extends DaoAuthenticationProvider {

	@Resource
	private PasswordEncoder passwordEncoder;

	@Override
	protected void additionalAuthenticationChecks(UserDetails userDetails, UsernamePasswordAuthenticationToken authentication) throws AuthenticationException {
		if (authentication.getCredentials() == null) {
			this.logger.debug("Authentication failed: no credentials provided");
			throw new BadCredentialsException(this.messages.getMessage("AbstractUserDetailsAuthenticationProvider.badCredentials", "Bad credentials"));
		} else {
			String presentedPassword = authentication.getCredentials().toString();

			String decryptPassword = null;
			//解密登陆密码
			try {
				decryptPassword=RsaUtil.decryptByPrivateKey(presentedPassword);
			} catch (Exception e) {
				e.printStackTrace();
			}
			if (!this.passwordEncoder.matches(decryptPassword, userDetails.getPassword())) {
				this.logger.debug("Authentication failed: password does not match stored value");
				throw new BadCredentialsException(this.messages.getMessage("AbstractUserDetailsAuthenticationProvider.badCredentials", "Bad credentials"));
			}
		}
	}
}
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将 MyAuthenticationProvider 注入到Spring容器

@Bean
public MyAuthenticationProvider eacpsAuthenticationProvider() {
    MyAuthenticationProvider myAuthenticationProvider = new MyAuthenticationProvider();
    myAuthenticationProvider.setUserDetailsService(rbacUserDetailsService);
    return myAuthenticationProvider;
}
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需要注意的是，在注入MyAuthenticationProvider的时候，一定要记得将自己的myUserDetailService（myUserDetailService为Spring Security默认

UserDetailsService的实现类）传入到MyAuthenticationProvider中，否则将会报错，至此就全部完成了。