AuthService.java

/*
 * Copyright 2013 David Tinker
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.qdb.server.security;

import io.qdb.server.repo.Repository;
import io.qdb.server.model.User;
import org.simpleframework.http.Request;
import org.simpleframework.http.Response;

import javax.inject.Inject;
import javax.inject.Singleton;
import javax.xml.bind.DatatypeConverter;
import java.io.IOException;

/**
 * Authenticates users.
 */
@Singleton
public class AuthService {

    private final Repository userRepository;

    @Inject
    public AuthService(Repository userRepository) {
        this.userRepository = userRepository;
    }

    /**
     * Authenticate a user using information from req. Returns null if authentication failed in which case
     * an appropriate error code and message will have been written to resp.
     */
    public Auth authenticate(Request req, Response resp) throws IOException {
        String s = req.getValue("Authorization");
        if (s == null) {
            User user = userRepository.findUser("admin");
            if (user != null && user.doesPasswordMatch("admin")) return new Auth(user, "Auto");
            return new Auth();
        }

        if (s.startsWith("Basic ")) {
            try {
                s = new String(DatatypeConverter.parseBase64Binary(s.substring(6)), "UTF8");
                int i = s.indexOf(':');
                if (i > 0) {
                    String username = s.substring(0, i);
                    String password = s.substring(i + 1);
                    User user = userRepository.findUser(username);
                    if (user != null && user.doesPasswordMatch(password)) {
                        return new Auth(user, "Basic");
                    }
                }
            } catch (IllegalArgumentException ignore) {
            }
        }

        sendChallenge(resp);
        return null;
    }

    public void sendChallenge(Response resp) {
        resp.setCode(401);
        resp.set("WWW-Authenticate", "basic realm=\"qdb\"");
    }

}