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/*
* This file is part of vospace-file-service
* Copyright (C) 2021 Istituto Nazionale di Astrofisica
* SPDX-License-Identifier: GPL-3.0-or-later
*/
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package it.inaf.ia2.transfer.auth;
import it.inaf.ia2.aa.jwt.InvalidTokenException;
import it.inaf.ia2.aa.jwt.TokenParser;
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.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class TokenFilter implements Filter {
private static final Logger LOG = LoggerFactory.getLogger(TokenFilter.class);
private final TokenParser tokenParser;
public TokenFilter(TokenParser tokenParser) {
this.tokenParser = tokenParser;
}
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
String token = getToken(request);
TokenPrincipal tokenPrincipal;
try {
tokenPrincipal = getTokenPrincipal(token);
} catch (InvalidTokenException ex) {
response.sendError(401, "Unauthorized: " + ex.getMessage());
return;
}
RequestWithPrincipal requestWrapper = new RequestWithPrincipal(request, tokenPrincipal);
chain.doFilter(requestWrapper, response);
}
private String getToken(HttpServletRequest request) {
String token = getTokenFromHeader(request);
if (token == null) {
// get token from query string
token = request.getParameter("token");
}
return token;
}
private String getTokenFromHeader(HttpServletRequest request) {
LOG.trace("Loading token from header");
String authHeader = request.getHeader("Authorization");
if (authHeader != null) {
if (authHeader.startsWith("Bearer")) {
return authHeader.substring("Bearer".length() + 1).trim();
} else {
LOG.warn("Detected non-Bearer Authorization header");
}
}
return null;
}
private TokenPrincipal getTokenPrincipal(String token) {
if (token == null) {
// anonymous
return new TokenPrincipal();
}
Map<String, Object> claims = tokenParser.getClaims(token);
String userId = (String) claims.get("sub");
if (userId == null) {
throw new InvalidTokenException("Missing sub claim");
}
return new TokenPrincipal(userId, token);
}
private static class RequestWithPrincipal extends HttpServletRequestWrapper {
private final TokenPrincipal tokenPrincipal;
public RequestWithPrincipal(HttpServletRequest request, TokenPrincipal tokenPrincipal) {
super(request);
this.tokenPrincipal = tokenPrincipal;
}
@Override
public Principal getUserPrincipal() {
return tokenPrincipal;
}
}
}