source: phonelux-backend/src/main/java/finki/it/phoneluxbackend/security/CustomAuthenticationFilter.java@ 775e15e

package finki.it.phoneluxbackend.security;

import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.fasterxml.jackson.databind.ObjectMapper;
import finki.it.phoneluxbackend.entities.User;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

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.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;

import static org.springframework.http.MediaType.APPLICATION_JSON_VALUE;

public class CustomAuthenticationFilter extends UsernamePasswordAuthenticationFilter {
    private final AuthenticationManager authenticationManager;

    public CustomAuthenticationFilter(AuthenticationManager authenticationManager) {
        this.authenticationManager = authenticationManager;
    }

    @Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
        String email = request.getParameter("email");
        String password = request.getParameter("password");
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(email,password);
        return authenticationManager.authenticate(authenticationToken);
    }

    @Override
    protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authentication) throws IOException, ServletException {
        User user = (User)authentication.getPrincipal();
        Algorithm algorithm = Algorithm.HMAC256("secret".getBytes());

        String access_token = JWT.create()
                .withSubject(user.getEmail())
                .withExpiresAt(new Date(System.currentTimeMillis() + 10 * 60 * 100000)) // approx. 16.5 hours
                .withIssuer(request.getRequestURL().toString())
                .withClaim("role", user.getAuthorities().stream()
                        .map(GrantedAuthority::getAuthority).collect(Collectors.toList()))
                .withClaim("name", user.getFirstName())
                .withClaim("id", user.getId())
                .sign(algorithm);


        Map<String,String> authInfo = new HashMap<>();
        authInfo.put("access_token",access_token);
        response.setContentType(APPLICATION_JSON_VALUE);
        new ObjectMapper().writeValue(response.getOutputStream(),authInfo);
    }
}