io.mapzone.controller.vm.http.LoginProvision.java Source code

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Here is the source code for io.mapzone.controller.vm.http.LoginProvision.java

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/* 
 * mapzone.io
 * Copyright (C) 2016, the @authors. All rights reserved.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 3.0 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 */
package io.mapzone.controller.vm.http;

import java.util.Arrays;
import java.util.Map;
import java.util.Optional;
import java.util.Random;
import java.util.concurrent.ConcurrentHashMap;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.google.common.base.Joiner;

import org.eclipse.rap.rwt.RWT;

import org.polymap.core.ui.UIUtils;

import io.mapzone.controller.LoginAppDesign;
import io.mapzone.controller.provision.Context;
import io.mapzone.controller.provision.Provision;
import io.mapzone.controller.provision.ProvisionRuntimeException;
import io.mapzone.controller.um.repository.LoginCookie;
import io.mapzone.controller.um.repository.Project;
import io.mapzone.controller.um.repository.User;

/**
 * Makes sure that the user is properly logged in.
 *
 * @author Falko Brutigam
 */
public class LoginProvision extends HttpProxyProvision {

    private static final Log log = LogFactory.getLog(LoginProvision.class);

    public static final String COOKIE_NAME = "lp";
    public static final String COOKIE_PATH = ProxyServlet.SERVLET_ALIAS;
    public static final int COOKIE_MAX_AGE = -1; //(int)TimeUnit.DAYS.toSeconds( 1 );

    /** Maps the generated random handle into {@link User} id. */
    private static Map<String, String> loggedIn = new ConcurrentHashMap(256, 0.75f, 4);

    private static Random rand = new Random();

    private Context<LoginProvision> checked;

    @Override
    public boolean init(Provision failed, Status cause) {
        // check only UI requests (skip rwt-resources/generated/) in order to
        // not do UI login for service/API requests (/ows, /webdav)
        // XXX use Project#servletAlias
        return request.get().getPathInfo().endsWith(Project.DEFAULT_SERVLET_ALIAS)
                && failed instanceof ForwardRequest && cause == null && !checked.isPresent();
    }

    @Override
    public Status execute() throws Exception {
        checked.set(this);

        // check authToken
        AuthTokenValidator atv = new AuthTokenValidator(() -> projectUow(), request.get());
        if (atv.checkAuthToken()) {
            String clientHost = request.get().getRemoteHost();
            log.info("AuthToken: valid, for client: " + clientHost);
            registerUser(clientHost, response.get());
            // who we are? does arena need a user?
            return OK_STATUS;
        }

        // cookie -> OK
        Optional<Cookie> cookie = Arrays.stream(request.get().getCookies())
                .filter(c -> c.getName().equals(COOKIE_NAME)).findAny();
        if (cookie.isPresent()) {
            String userId = loggedIn.get(cookie.get().getValue());
            if (userId != null) {
                return OK_STATUS;
            }
        }

        // check /dashboard login
        Optional<LoginCookie> loginCookie = LoginCookie.access(request.get(), response.get()).findAndUpdate();
        if (loginCookie.isPresent()) {
            registerUser((String) loginCookie.get().user.get().id(), response.get());
            return OK_STATUS;
        }

        // no cookie -> /login
        String requestUrl = Joiner.on("").skipNulls().join(request.get().getServletPath(),
                request.get().getPathInfo(), "?", request.get().getQueryString());
        String handlerId = LoginAppDesign.registerHandler(user -> {
            try {
                registerUser((String) user.id(), RWT.getResponse());
                UIUtils.exec("window.location=\"", requestUrl, "\";");
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        });
        // http://stackoverflow.com/questions/30844807/can-a-redirect-to-relative-path-be-sent-from-java-servlet-api
        // response.get().sendRedirect( "../../../login?id=" + handlerId );
        response.get().setStatus(HttpServletResponse.SC_MOVED_TEMPORARILY);
        response.get().setHeader("Location", "../../../login?id=" + handlerId);
        throw new ProvisionRuntimeException();
    }

    protected void registerUser(String userId, @SuppressWarnings("hiding") HttpServletResponse response) {
        // cookie token
        byte[] bytes = new byte[8];
        rand.nextBytes(bytes);
        String token = Base64.encodeBase64URLSafeString(bytes);

        // FIXME Leak: entries are never removed (allow just one cookie/session per user?)
        if (loggedIn.putIfAbsent(token, userId) != null) {
            throw new IllegalStateException("Token already exists: " + token);
        }

        // set cookie
        Cookie newCookie = new Cookie(COOKIE_NAME, token);
        newCookie.setHttpOnly(true);
        newCookie.setPath(COOKIE_PATH);
        newCookie.setSecure(false); // XXX
        newCookie.setMaxAge(COOKIE_MAX_AGE);
        response.addCookie(newCookie);
    }

}