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/*
 * Juick
 * Copyright (C) 2008-2011, Ugnich Anton
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.juick.www;

import com.juick.server.UserQueries;
import com.juick.xmpp.JID;
import com.juick.xmpp.Stream;
import com.juick.xmpp.StreamComponent;
import net.jodah.failsafe.Execution;
import net.jodah.failsafe.RetryPolicy;
import org.apache.commons.dbcp2.BasicDataSource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.xmlpull.v1.XmlPullParserException;
import ru.sape.Sape;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.Socket;
import java.net.URLEncoder;
import java.util.Objects;
import java.util.Properties;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

/**
 *
 * @author Ugnich Anton
 */
@WebServlet(name = "Main", urlPatterns = {"/"})
@MultipartConfig(fileSizeThreshold = 1024 * 1024, maxRequestSize = 1024 * 1024 * 10)
public class Main extends HttpServlet implements Stream.StreamListener {

    JdbcTemplate sql;
    JdbcTemplate sqlSearch;
    String sqlSearchConnStr = "jdbc:mysql://127.0.0.1:9306?autoReconnect=true&useUnicode=yes&characterEncoding=utf8&maxAllowedPacket=512000";
    Stream xmpp;
    Home home = new Home();
    Discover discover = new Discover();
    PM pm = new PM();
    Login login = new Login();
    Help help = new Help();
    User pagesUser = new User();
    UserThread pagesUserThread = new UserThread();
    NewMessage pagesNewMessage;
    FacebookLogin loginFacebook = new FacebookLogin();
    VKontakteLogin loginVK = new VKontakteLogin();
    TwitterAuth twitterAuth;
    SignUp signup = new SignUp();
    Settings settings = new Settings();
    RSS rss = new RSS();
    ExecutorService executorService = Executors.newSingleThreadScheduledExecutor();
    Execution execution;

    @Override
    public void init() throws ServletException {

        super.init();
        try {
            Properties conf = new Properties();
            conf.load(getServletContext().getResourceAsStream("/WEB-INF/juick.conf"));

            BasicDataSource dataSource = new BasicDataSource();
            dataSource.setDriverClassName(conf.getProperty("datasource_driver", "com.mysql.jdbc.Driver"));
            dataSource.setUrl(conf.getProperty("datasource_url"));
            BasicDataSource dataSourceSearch = new BasicDataSource();
            dataSourceSearch.setDriverClassName(conf.getProperty("datasource_driver", "com.mysql.jdbc.Driver"));
            dataSourceSearch.setUrl(sqlSearchConnStr);
            sql = new JdbcTemplate(dataSource);
            sqlSearch = new JdbcTemplate(dataSourceSearch);

            setupXmppComponent(new JID(conf.getProperty("www_xmpp_jid", "www.juick.local")), conf.getProperty("xmpp_password"));
            twitterAuth = new TwitterAuth(conf.getProperty("twitter_consumer_key"),
                    conf.getProperty("twitter_consumer_secret"));
            pagesNewMessage = new NewMessage(conf.getProperty("upload_tmp_dir", "/var/www/juick.com/i/tmp/"),
                    conf.getProperty("img_path", "/var/www/juick.com/i/"));
            String sapeUser = conf.getProperty("sape_user", "");
            if (!Objects.equals(sapeUser, "")) {
                PageTemplates.sape = new Sape(sapeUser, "juick.com", 2000, 3600);
            } else {
                log("Sape is not initialized");
            }
        } catch (Exception e) {
            log(null, e);
        }
    }

    public void setupXmppComponent(final JID componentJid, final String password) {
        @SuppressWarnings("unchecked") RetryPolicy retryPolicy = new RetryPolicy()
                .withBackoff(1, 30, TimeUnit.SECONDS)
                .withJitter(0.1)
                .retryOn(IOException.class, XmlPullParserException.class);
        execution = new Execution(retryPolicy);
        executorService.submit(() -> {
            while (!execution.isComplete()) {
                try {
                    Socket socket = new Socket("localhost", 5347);
                    xmpp = new StreamComponent(componentJid, socket.getInputStream(), socket.getOutputStream(), password);
                    xmpp.addListener(Main.this);
                    xmpp.startParsing();
                } catch (IOException e) {
                    log("XMPP router disconnected, reconnecting...");
                }
            }
        });
    }

    @Override
    public void onStreamFail(Exception e) {
        log("XMPP STREAM FAIL:" + e);
        execution.recordFailure(e);
    }

    @Override
    public void onStreamReady() {
        log("XMPP STREAM READY");
    }


    /**
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        if (request.getCharacterEncoding() == null) {
            request.setCharacterEncoding("UTF-8");
        }
        String uri = request.getRequestURI();

        if (uri.equals("/")) {
            String tag = request.getParameter("tag");
            if (tag != null) {
                Utils.sendPermanentRedirect(response, "/tag/" + URLEncoder.encode(tag, "UTF-8"));
            } else {
                com.juick.User visitor = Utils.getVisitorUser(sql, request, response);
                home.doGet(sql, sqlSearch, request, response, visitor);
            }
        } else if (uri.equals("/post")) {
            com.juick.User visitor = Utils.getVisitorUser(sql, request, response);
            if (visitor.getUID() > 0) {
                pagesNewMessage.doGetNewMessage(sql, request, response, visitor);
            } else {
                Utils.sendTemporaryRedirect(response, "/login");
            }
        } else if (uri.equals("/login")) {
            if (request.getQueryString() == null) {
                login.doGetLoginForm(sql, request, response);
            } else {
                login.doGetLogin(sql, request, response);
            }
        } else if (uri.startsWith("/pm/")) {
            com.juick.User visitor = Utils.getVisitorUser(sql, request, response);
            if (visitor.getUID() == 0) {
                Utils.sendTemporaryRedirect(response, "/login");
            } else {
                switch (uri) {
                    case "/pm/inbox":
                        pm.doGetInbox(sql, request, response, visitor);
                        break;
                    case "/pm/sent":
                        pm.doGetSent(sql, request, response, visitor);
                        break;
                    default:
                        Errors.doGet404(sql, request, response);
                        break;
                }
            }
        } else if (uri.startsWith("/rss/")) {
            String uname = uri.substring(5);
            int uid = UserQueries.getUIDbyName(sql, uname);
            if (uid > 0) {
                rss.doGet(sql, request, response, uid, uname);
            } else {
                response.sendError(404);
            }
        } else if (uri.equals("/logout")) {
            login.doGetLogout(sql, request, response);
        } else if (uri.equals("/settings")) {
            settings.doGet(sql, request, response);
        } else if (uri.equals("/_fblogin")) {
            loginFacebook.doGet(sql, request, response);
        } else if (uri.equals("/_vklogin")) {
            loginVK.doGet(sql, request, response);
        } else if (uri.startsWith("/_twitter")) {
            twitterAuth.doGet(sql, request, response);
        } else if (uri.equals("/signup")) {
            signup.doGet(sql, request, response);
        } else if (uri.equals("/help") || uri.equals("/help/")) {
            help.doRedirectToHelpIndex(response);
        } else if (uri.startsWith("/help/")) {
            help.doGetHelp(sql, request, response);
        } else if (uri.startsWith("/tag/")) {
            discover.doGet(sql, sqlSearch, request, response);
        } else if (uri.matches("^/\\d+$")) {
            String strID = request.getRequestURI().substring(1);
            int mid = 0;
            try {
                mid = Integer.parseInt(strID);
            } catch (NumberFormatException e) {
            }
            if (mid > 0) {
                com.juick.User author = com.juick.server.MessagesQueries.getMessageAuthor(sql, mid);
                if (author != null) {
                    Utils.sendPermanentRedirect(response, "/" + author.getUName() + "/" + mid);
                    return;
                }
            }
            Errors.doGet404(sql, request, response);
        } else if (uri.matches("^/[^/]+$")) {
            com.juick.User user = com.juick.server.UserQueries.getUserByName(sql, request.getRequestURI().substring(1));
            if (user != null) {
                Utils.sendPermanentRedirect(response, "/" + user.getUName() + "/");
            } else {
                Errors.doGet404(sql, request, response);
            }
        } else if (uri.matches("^/.+/.*")) {
            String uriparts[] = uri.split("/");
            com.juick.User user = com.juick.server.UserQueries.getUserByName(sql, uriparts[1]);
            if (user != null && user.getUName().equals(uriparts[1]) && !user.Banned) {
                if (uriparts.length == 2) { // http://juick.com/username/
                    pagesUser.doGetBlog(sql, sqlSearch, request, response, user);
                } else if (uriparts[2].equals("tags")) {
                    pagesUser.doGetTags(sql, request, response, user);
                } else if (uriparts[2].equals("friends")) {
                    pagesUser.doGetFriends(sql, request, response, user);
                } else if (uriparts[2].equals("readers")) {
                    pagesUser.doGetReaders(sql, request, response, user);
                } else {
                    int mid = 0;
                    try {
                        mid = Integer.parseInt(uriparts[2]);
                    } catch (NumberFormatException e) {
                    }
                    if (mid > 0) {
                        com.juick.User author = com.juick.server.MessagesQueries.getMessageAuthor(sql, mid);
                        if (author != null) {
                            if (!author.getUName().equals(user.getUName())) {
                                Utils.sendPermanentRedirect(response, "/" + author.getUName() + "/" + mid);
                            } else {
                                pagesUserThread.doGetThread(sql, request, response, mid);
                            }
                        } else {
                            Errors.doGet404(sql, request, response);
                        }
                    } else {
                        Errors.doGet404(sql, request, response);
                    }
                }
            } else if (user != null && !user.Banned) {
                Utils.sendPermanentRedirect(response, "/" + user.getUName() + "/" + (uriparts.length > 2 ? uriparts[2] : ""));
            } else {
                Errors.doGet404(sql, request, response);
            }
        } else {
            Errors.doGet404(sql, request, response);
        }
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        if (request.getCharacterEncoding() == null) {
            request.setCharacterEncoding("UTF-8");
        }

        String uri = request.getRequestURI();
        switch (uri) {
            case "/post": {
                com.juick.User visitor = Utils.getVisitorUser(sql, request, response);
                if (visitor.getUID() > 0 && !visitor.Banned) {
                    pagesNewMessage.doPostMessage(sql, request, response, xmpp, visitor);
                } else {
                    response.sendError(403);
                }
                break;
            }
            case "/comment": {
                com.juick.User visitor = Utils.getVisitorUser(sql, request, response);
                if (visitor.getUID() > 0 && !visitor.Banned) {
                    pagesNewMessage.doPostComment(sql, request, response, xmpp, visitor);
                } else {
                    response.sendError(403);
                }
                break;
            }
            case "/like": {
                com.juick.User visitor = Utils.getVisitorUser(sql, request, response);
                if (visitor.getUID() > 0 && !visitor.Banned) {
                    pagesNewMessage.doPostRecomm(sql, request, response, xmpp, visitor);
                } else {
                    response.sendError(403);
                }
                break;
            }
            case "/pm/send": {
                com.juick.User visitor = Utils.getVisitorUser(sql, request, response);
                if (visitor.getUID() > 0 && !visitor.Banned) {
                    pm.doPostPM(sql, request, response, xmpp, visitor);
                } else {
                    response.sendError(403);
                }
                break;
            }
            case "/login":
                login.doPostLogin(sql, request, response);
                break;
            case "/signup":
                signup.doPost(sql, request, response);
                break;
            case "/settings":
                settings.doPost(sql, request, response);
                break;
            default:
                response.sendError(405);
                break;
        }
    }
}