TokenAuthenticationProvider.java

package com.example.solidconnection.security.authentication;

import com.example.solidconnection.auth.service.TokenProvider;
import com.example.solidconnection.security.userdetails.SiteUserDetails;
import com.example.solidconnection.security.userdetails.SiteUserDetailsService;
import lombok.RequiredArgsConstructor;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.stereotype.Component;

@Component
@RequiredArgsConstructor
public class TokenAuthenticationProvider implements AuthenticationProvider {

    private final SiteUserDetailsService siteUserDetailsService;
    private final TokenProvider tokenProvider;

    @Override
    public Authentication authenticate(Authentication auth) throws AuthenticationException {
        TokenAuthentication tokenAuth = (TokenAuthentication) auth;
        String token = tokenAuth.getToken();

        String username = tokenProvider.parseSubject(token);
        SiteUserDetails userDetails = (SiteUserDetails) siteUserDetailsService.loadUserByUsername(username);
        return new TokenAuthentication(token, userDetails);
    }

    @Override
    public boolean supports(Class<?> authentication) {
        return TokenAuthentication.class.isAssignableFrom(authentication);
    }
}