JwtFilter.java

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package com.student_loan.security;
 
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;
 
import java.io.IOException;
import java.util.List;
 
public class JwtFilter extends OncePerRequestFilter {
 
    private final JwtUtil jwtUtil;
 
    public JwtFilter(JwtUtil jwtUtil) {
        this.jwtUtil = jwtUtil;
    }
 
    @Override
    public void doFilterInternal(HttpServletRequest request,
                                    HttpServletResponse response,
                                    FilterChain filterChain) throws ServletException, IOException {
 
        String authHeader = request.getHeader("Authorization");
 
        if (authHeader != null && authHeader.startsWith("Bearer ")) {
            String token = authHeader.substring(7);
 
            if (jwtUtil.validateToken(token)) {
                String email = jwtUtil.extractEmail(token);
 
                List<GrantedAuthority> authorities = List.of(new SimpleGrantedAuthority("ROLE_USER"));
 
                UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(
                        email, null, authorities);
 
                authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
 
                SecurityContextHolder.getContext().setAuthentication(authentication);
            }
        }
 
        filterChain.doFilter(request, response);
    }
}