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package it.inaf.ia2.gms.authn;
import java.io.IOException;
import java.security.Principal;
import java.util.Map;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.oauth2.common.OAuth2AccessToken;
import org.springframework.security.oauth2.provider.token.store.jwk.JwkTokenStore;
public class JWTFilter implements Filter {
private final JwkTokenStore jwkTokenStore;
public JWTFilter(JwkTokenStore jwkTokenStore) {
this.jwkTokenStore = jwkTokenStore;
}
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain fc) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
String authHeader = request.getHeader("Authorization");
if (authHeader == null) {
response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Missing Authorization token");
return;
}
authHeader = authHeader.replace("Bearer", "").trim();
OAuth2AccessToken accessToken = jwkTokenStore.readAccessToken(authHeader);
if (accessToken.isExpired()) {
response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Access token is expired");
return;
}
Map<String, Object> claims = accessToken.getAdditionalInformation();
String principal = (String) claims.get("sub");
if (principal == null) {
response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Invalid access token: missing sub claim");
return;
}
ServletRequest wrappedRequest = new ServletRequestWithJWTPrincipal(request, principal);
fc.doFilter(wrappedRequest, res);
}
private static class ServletRequestWithJWTPrincipal extends HttpServletRequestWrapper {
private final String principal;
public ServletRequestWithJWTPrincipal(HttpServletRequest request, String principal) {
super(request);
this.principal = principal;
}
@Override
public Principal getUserPrincipal() {
return new UsernamePasswordAuthenticationToken(principal, null);
}
}
}