text: console.log("Welcome to Uptime Kuma");
  const args = require("args-parser")(process.argv);
  const { sleep, debug, getRandomInt, genSecret } = require("../src/util");
  const config = require("./config");
  
  debug(args);
  
  if (! process.env.NODE_ENV) {
      process.env.NODE_ENV = "production";
  }
  
  console.log("Node Env: " + process.env.NODE_ENV);
  
  console.log("Importing Node libraries");
  const fs = require("fs");
  const http = require("http");
  const https = require("https");
  
  console.log("Importing 3rd-party libraries");
  debug("Importing express");
  const express = require("express");
  debug("Importing socket.io");
  const { Server } = require("socket.io");
  debug("Importing redbean-node");
  const { R } = require("redbean-node");
  debug("Importing jsonwebtoken");
  const jwt = require("jsonwebtoken");
  debug("Importing http-graceful-shutdown");
  const gracefulShutdown = require("http-graceful-shutdown");
  debug("Importing prometheus-api-metrics");
  const prometheusAPIMetrics = require("prometheus-api-metrics");
  debug("Importing compare-versions");
  const compareVersions = require("compare-versions");
  const { passwordStrength } = require("check-password-strength");
  
  debug("Importing 2FA Modules");
  const notp = require("notp");
  const base32 = require("thirty-two");
  
  console.log("Importing this project modules");
  debug("Importing Monitor");
  const Monitor = require("./model/monitor");
  debug("Importing Settings");
  const { getSettings, setSettings, setting, initJWTSecret, checkLogin, startUnitTest, FBSD } = require("./util-server");
  
  debug("Importing Notification");
  const { Notification } = require("./notification");
  Notification.init();
  
  debug("Importing Database");
  const Database = require("./database");
  
  debug("Importing Background Jobs");
  const { initBackgroundJobs } = require("./jobs");
  
  const { basicAuth } = require("./auth");
  const { login } = require("./auth");
  const passwordHash = require("./password-hash");
  
  const checkVersion = require("./check-version");
  console.info("Version: " + checkVersion.version);
  
  // If host is omitted, the server will accept connections on the unspecified IPv6 address (::) when IPv6 is available and the unspecified IPv4 address (0.0.0.0) otherwise.
  // Dual-stack support for (::)
  let hostname = process.env.UPTIME_KUMA_HOST || args.host;
  
  // Also read HOST if not FreeBSD, as HOST is a system environment variable in FreeBSD
  if (!hostname && !FBSD) {
      hostname = process.env.HOST;
  }
  
  if (hostname) {
      console.log("Custom hostname: " + hostname);
  }
  
  const port = parseInt(process.env.UPTIME_KUMA_PORT || process.env.PORT || args.port || 3001);
  
  // SSL
  const sslKey = process.env.UPTIME_KUMA_SSL_KEY || process.env.SSL_KEY || args["ssl-key"] || undefined;
  const sslCert = process.env.UPTIME_KUMA_SSL_CERT || process.env.SSL_CERT || args["ssl-cert"] || undefined;
  const disableFrameSameOrigin = !!process.env.UPTIME_KUMA_DISABLE_FRAME_SAMEORIGIN || args["disable-frame-sameorigin"] || false;
  
  // 2FA / notp verification defaults
  const twofa_verification_opts = {
      "window": 1,
      "time": 30
  };
  
  /**
   * Run unit test after the server is ready
   * @type {boolean}
   */
  const testMode = !!args["test"] || false;
  
  if (config.demoMode) {
      console.log("==== Demo Mode ====");
  }
  
  console.log("Creating express and socket.io instance");
  const app = express();
  
  let server;
  
  if (sslKey && sslCert) {
      console.log("Server Type: HTTPS");
      server = https.createServer({
          key: fs.readFileSync(sslKey),
          cert: fs.readFileSync(sslCert)
      }, app);
  } else {
      console.log("Server Type: HTTP");
      server = http.createServer(app);
  }
  
  const io = new Server(server);
  module.exports.io = io;
  
  // Must be after io instantiation
  const { sendNotificationList, sendHeartbeatList, sendImportantHeartbeatList, sendInfo } = require("./client");
  const { statusPageSocketHandler } = require("./socket-handlers/status-page-socket-handler");
  
  app.use(express.json());
  
  // Global Middleware
  app.use(function (req, res, next) {
      if (!disableFrameSameOrigin) {
          res.setHeader("X-Frame-Options", "SAMEORIGIN");
      }
      res.removeHeader("X-Powered-By");
      next();
  });
  
  /**
   * Total WebSocket client connected to server currently, no actual use
   * @type {number}
   */
  let totalClient = 0;
  
  /**
   * Use for decode the auth object
   * @type {null}
   */
  let jwtSecret = null;
  
  /**
   * Main monitor list
   * @type {{}}
   */
  let monitorList = {};
  
  /**
   * Show Setup Page
   * @type {boolean}
   */
  let needSetup = false;
  
  /**
   * Cache Index HTML
   * @type {string}
   */
  let indexHTML = "";
  
  try {
      indexHTML = fs.readFileSync("./dist/index.html").toString();
  } catch (e) {
      // "dist/index.html" is not necessary for development
      if (process.env.NODE_ENV !== "development") {
          console.error("Error: Cannot find 'dist/index.html', did you install correctly?");
          process.exit(1);
      }
  }
  
  exports.entryPage = "dashboard";
  
  (async () => {
      Database.init(args);
      await initDatabase();
  
      exports.entryPage = await setting("entryPage");
  
      console.log("Adding route");
  
      // ***************************
      // Normal Router here
      // ***************************
  
      // Robots.txt
      app.get("/robots.txt", async (_request, response) => {
          let txt = "User-agent: *\nDisallow:";
          if (! await setting("searchEngineIndex")) {
              txt += " /";
          }
          response.setHeader("Content-Type", "text/plain");
          response.send(txt);
      });
  
      // Basic Auth Router here
  
      // Prometheus API metrics  /metrics
      // With Basic Auth using the first user's username/password
      app.get("/metrics", basicAuth, prometheusAPIMetrics());
  
      app.use("/", express.static("dist"));
  
      // ./data/upload
      app.use("/upload", express.static(Database.uploadDir));
  
      app.get("/.well-known/change-password", async (_, response) => {
          response.redirect("https://github.com/louislam/uptime-kuma/wiki/Reset-Password-via-CLI");
      });
  
      // API Router
      const apiRouter = require("./routers/api-router");
      app.use(apiRouter);
  
      // Universal Route Handler, must be at the end of all express routes.
      app.get("*", async (_request, response) => {
          if (_request.originalUrl.startsWith("/upload/")) {
              response.status(404).send("File not found.");
          } else {
              response.send(indexHTML);
          }
      });
  
      console.log("Adding socket handler");
      io.on("connection", async (socket) => {
  
          sendInfo(socket);
  
          totalClient++;
  
          if (needSetup) {
              console.log("Redirect to setup page");
              socket.emit("setup");
          }
  
          socket.on("disconnect", () => {
              totalClient--;
          });
  
          // ***************************
          // Public Socket API
          // ***************************
  
          socket.on("loginByToken", async (token, callback) => {
  
              try {
                  let decoded = jwt.verify(token, jwtSecret);
  
                  console.log("Username from JWT: " + decoded.username);
  
                  let user = await R.findOne("user", " username = ? AND active = 1 ", [
                      decoded.username,
                  ]);
  
                  if (user) {
                      debug("afterLogin");
  
                      afterLogin(socket, user);
  
                      debug("afterLogin ok");
  
                      callback({
                          ok: true,
                      });
                  } else {
                      callback({
                          ok: false,
                          msg: "The user is inactive or deleted.",
                      });
                  }
              } catch (error) {
                  callback({
                      ok: false,
                      msg: "Invalid token.",
                  });
              }
  
          });
  
          socket.on("login", async (data, callback) => {
              console.log("Login");
  
              let user = await login(data.username, data.password);
  
              if (user) {
                  afterLogin(socket, user);
  
                  if (user.twofaStatus == 0) {
                      callback({
                          ok: true,
                          token: jwt.sign({
                              username: data.username,
                          }, jwtSecret),
                      });
                  }
  
                  if (user.twofaStatus == 1 && !data.token) {
                      callback({
                          tokenRequired: true,
                      });
                  }
  
                  if (data.token) {
                      let verify = notp.totp.verify(data.token, user.twofa_secret, twofa_verification_opts);
  
                      if (verify && verify.delta == 0) {
                          callback({
                              ok: true,
                              token: jwt.sign({
                                  username: data.username,
                              }, jwtSecret),
                          });
                      } else {
                          callback({
                              ok: false,
                              msg: "Invalid Token!",
                          });
                      }
                  }
              } else {
                  callback({
                      ok: false,
                      msg: "Incorrect username or password.",
                  });
              }
  
          });
  
          socket.on("logout", async (callback) => {
              socket.leave(socket.userID);
              socket.userID = null;
              callback();
          });
  
          socket.on("prepare2FA", async (callback) => {
              try {
                  checkLogin(socket);
  
                  let user = await R.findOne("user", " id = ? AND active = 1 ", [
                      socket.userID,
                  ]);
  
                  if (user.twofa_status == 0) {
                      let newSecret = genSecret();
                      let encodedSecret = base32.encode(newSecret);
  
                      // Google authenticator doesn't like equal signs
                      // The fix is found at https://github.com/guyht/notp
                      // Related issue: https://github.com/louislam/uptime-kuma/issues/486
                      encodedSecret = encodedSecret.toString().replace(/=/g, "");
  
                      let uri = `otpauth://totp/Uptime%20Kuma:${user.username}?secret=${encodedSecret}`;
  
                      await R.exec("UPDATE `user` SET twofa_secret = ? WHERE id = ? ", [
                          newSecret,
                          socket.userID,
                      ]);
  
                      callback({
                          ok: true,
                          uri: uri,
                      });
                  } else {
                      callback({
                          ok: false,
                          msg: "2FA is already enabled.",
                      });
                  }
              } catch (error) {
                  callback({
                      ok: false,
                      msg: "Error while trying to prepare 2FA.",
                  });
              }
          });
  
          socket.on("save2FA", async (callback) => {
              try {
                  checkLogin(socket);
  
                  await R.exec("UPDATE `user` SET twofa_status = 1 WHERE id = ? ", [
                      socket.userID,
                  ]);
  
                  callback({
                      ok: true,
                      msg: "2FA Enabled.",
                  });
              } catch (error) {
                  callback({
                      ok: false,
                      msg: "Error while trying to change 2FA.",
                  });
              }
          });
  
          socket.on("disable2FA", async (callback) => {
              try {
                  checkLogin(socket);
  
                  await R.exec("UPDATE `user` SET twofa_status = 0 WHERE id = ? ", [
                      socket.userID,
                  ]);
  
                  callback({
                      ok: true,
                      msg: "2FA Disabled.",
                  });
              } catch (error) {
                  callback({
                      ok: false,
                      msg: "Error while trying to change 2FA.",
                  });
              }
          });
  
          socket.on("verifyToken", async (token, callback) => {
              let user = await R.findOne("user", " id = ? AND active = 1 ", [
                  socket.userID,
              ]);
  
              let verify = notp.totp.verify(token, user.twofa_secret, twofa_verification_opts);
  
              if (verify && verify.delta == 0) {
                  callback({
                      ok: true,
                      valid: true,
                  });
              } else {
                  callback({
                      ok: false,
                      msg: "Invalid Token.",
                      valid: false,
                  });
              }
          });
  
          socket.on("twoFAStatus", async (callback) => {
              checkLogin(socket);
  
              try {
                  let user = await R.findOne("user", " id = ? AND active = 1 ", [
                      socket.userID,
                  ]);
  
                  if (user.twofa_status == 1) {
                      callback({
                          ok: true,
                          status: true,
                      });
                  } else {
                      callback({
                          ok: true,
                          status: false,
                      });
                  }
              } catch (error) {
                  callback({
                      ok: false,
                      msg: "Error while trying to get 2FA status.",
                  });
              }
          });
  
          socket.on("needSetup", async (callback) => {
              callback(needSetup);
          });
  
          socket.on("setup", async (username, password, callback) => {
              try {
                  if (passwordStrength(password).value === "Too weak") {
                      throw new Error("Password is too weak. It should contain alphabetic and numeric characters. It must be at least 6 characters in length.");
                  }
  
                  if ((await R.count("user")) !== 0) {
                      throw new Error("Uptime Kuma has been initialized. If you want to run setup again, please delete the database.");
                  }
  
                  let user = R.dispense("user");
                  user.username = username;
                  user.password = passwordHash.generate(password);
                  await R.store(user);
  
                  needSetup = false;
  
                  callback({
                      ok: true,
                      msg: "Added Successfully.",
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          // ***************************
          // Auth Only API
          // ***************************
  
          // Add a new monitor
          socket.on("add", async (monitor, callback) => {
              try {
                  checkLogin(socket);
                  let bean = R.dispense("monitor");
  
                  let notificationIDList = monitor.notificationIDList;
                  delete monitor.notificationIDList;
  
                  monitor.accepted_statuscodes_json = JSON.stringify(monitor.accepted_statuscodes);
                  delete monitor.accepted_statuscodes;
  
                  bean.import(monitor);
                  bean.user_id = socket.userID;
                  await R.store(bean);
  
                  await updateMonitorNotification(bean.id, notificationIDList);
  
                  await startMonitor(socket.userID, bean.id);
                  await sendMonitorList(socket);
  
                  callback({
                      ok: true,
                      msg: "Added Successfully.",
                      monitorID: bean.id,
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          // Edit a monitor
          socket.on("editMonitor", async (monitor, callback) => {
              try {
                  checkLogin(socket);
  
                  let bean = await R.findOne("monitor", " id = ? ", [ monitor.id ]);
  
                  if (bean.user_id !== socket.userID) {
                      throw new Error("Permission denied.");
                  }
  
                  bean.name = monitor.name;
                  bean.type = monitor.type;
                  bean.url = monitor.url;
                  bean.method = monitor.method;
                  bean.body = monitor.body;
                  bean.headers = monitor.headers;
                  bean.interval = monitor.interval;
                  bean.retryInterval = monitor.retryInterval;
                  bean.hostname = monitor.hostname;
                  bean.maxretries = monitor.maxretries;
                  bean.port = monitor.port;
                  bean.keyword = monitor.keyword;
                  bean.ignoreTls = monitor.ignoreTls;
                  bean.upsideDown = monitor.upsideDown;
                  bean.maxredirects = monitor.maxredirects;
                  bean.accepted_statuscodes_json = JSON.stringify(monitor.accepted_statuscodes);
                  bean.dns_resolve_type = monitor.dns_resolve_type;
                  bean.dns_resolve_server = monitor.dns_resolve_server;
                  bean.pushToken = monitor.pushToken;
  
                  await R.store(bean);
  
                  await updateMonitorNotification(bean.id, monitor.notificationIDList);
  
                  if (bean.active) {
                      await restartMonitor(socket.userID, bean.id);
                  }
  
                  await sendMonitorList(socket);
  
                  callback({
                      ok: true,
                      msg: "Saved.",
                      monitorID: bean.id,
                  });
  
              } catch (e) {
                  console.error(e);
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("getMonitorList", async (callback) => {
              try {
                  checkLogin(socket);
                  await sendMonitorList(socket);
                  callback({
                      ok: true,
                  });
              } catch (e) {
                  console.error(e);
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("getMonitor", async (monitorID, callback) => {
              try {
                  checkLogin(socket);
  
                  console.log(`Get Monitor: ${monitorID} User ID: ${socket.userID}`);
  
                  let bean = await R.findOne("monitor", " id = ? AND user_id = ? ", [
                      monitorID,
                      socket.userID,
                  ]);
  
                  callback({
                      ok: true,
                      monitor: await bean.toJSON(),
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          // Start or Resume the monitor
          socket.on("resumeMonitor", async (monitorID, callback) => {
              try {
                  checkLogin(socket);
                  await startMonitor(socket.userID, monitorID);
                  await sendMonitorList(socket);
  
                  callback({
                      ok: true,
                      msg: "Resumed Successfully.",
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("pauseMonitor", async (monitorID, callback) => {
              try {
                  checkLogin(socket);
                  await pauseMonitor(socket.userID, monitorID);
                  await sendMonitorList(socket);
  
                  callback({
                      ok: true,
                      msg: "Paused Successfully.",
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("deleteMonitor", async (monitorID, callback) => {
              try {
                  checkLogin(socket);
  
                  console.log(`Delete Monitor: ${monitorID} User ID: ${socket.userID}`);
  
                  if (monitorID in monitorList) {
                      monitorList[monitorID].stop();
                      delete monitorList[monitorID];
                  }
  
                  await R.exec("DELETE FROM monitor WHERE id = ? AND user_id = ? ", [
                      monitorID,
                      socket.userID,
                  ]);
  
                  callback({
                      ok: true,
                      msg: "Deleted Successfully.",
                  });
  
                  await sendMonitorList(socket);
                  // Clear heartbeat list on client
                  await sendImportantHeartbeatList(socket, monitorID, true, true);
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("getTags", async (callback) => {
              try {
                  checkLogin(socket);
  
                  const list = await R.findAll("tag");
  
                  callback({
                      ok: true,
                      tags: list.map(bean => bean.toJSON()),
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("addTag", async (tag, callback) => {
              try {
                  checkLogin(socket);
  
                  let bean = R.dispense("tag");
                  bean.name = tag.name;
                  bean.color = tag.color;
                  await R.store(bean);
  
                  callback({
                      ok: true,
                      tag: await bean.toJSON(),
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("editTag", async (tag, callback) => {
              try {
                  checkLogin(socket);
  
                  let bean = await R.findOne("monitor", " id = ? ", [ tag.id ]);
                  bean.name = tag.name;
                  bean.color = tag.color;
                  await R.store(bean);
  
                  callback({
                      ok: true,
                      tag: await bean.toJSON(),
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("deleteTag", async (tagID, callback) => {
              try {
                  checkLogin(socket);
  
                  await R.exec("DELETE FROM tag WHERE id = ? ", [ tagID ]);
  
                  callback({
                      ok: true,
                      msg: "Deleted Successfully.",
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("addMonitorTag", async (tagID, monitorID, value, callback) => {
              try {
                  checkLogin(socket);
  
                  await R.exec("INSERT INTO monitor_tag (tag_id, monitor_id, value) VALUES (?, ?, ?)", [
                      tagID,
                      monitorID,
                      value,
                  ]);
  
                  callback({
                      ok: true,
                      msg: "Added Successfully.",
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("editMonitorTag", async (tagID, monitorID, value, callback) => {
              try {
                  checkLogin(socket);
  
                  await R.exec("UPDATE monitor_tag SET value = ? WHERE tag_id = ? AND monitor_id = ?", [
                      value,
                      tagID,
                      monitorID,
                  ]);
  
                  callback({
                      ok: true,
                      msg: "Edited Successfully.",
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("deleteMonitorTag", async (tagID, monitorID, value, callback) => {
              try {
                  checkLogin(socket);
  
                  await R.exec("DELETE FROM monitor_tag WHERE tag_id = ? AND monitor_id = ? AND value = ?", [
                      tagID,
                      monitorID,
                      value,
                  ]);
  
                  // Cleanup unused Tags
                  await R.exec("delete from tag where ( select count(*) from monitor_tag mt where tag.id = mt.tag_id ) = 0");
  
                  callback({
                      ok: true,
                      msg: "Deleted Successfully.",
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("changePassword", async (password, callback) => {
              try {
                  checkLogin(socket);
  
                  if (! password.newPassword) {
                      throw new Error("Invalid new password");
                  }
  
                  if (passwordStrength(password.newPassword).value === "Too weak") {
                      throw new Error("Password is too weak. It should contain alphabetic and numeric characters. It must be at least 6 characters in length.");
                  }
  
                  let user = await R.findOne("user", " id = ? AND active = 1 ", [
                      socket.userID,
                  ]);
  
                  if (user && passwordHash.verify(password.currentPassword, user.password)) {
  
                      user.resetPassword(password.newPassword);
  
                      callback({
                          ok: true,
                          msg: "Password has been updated successfully.",
                      });
                  } else {
                      throw new Error("Incorrect current password");
                  }
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("getSettings", async (callback) => {
              try {
                  checkLogin(socket);
  
                  callback({
                      ok: true,
                      data: await getSettings("general"),
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("setSettings", async (data, callback) => {
              try {
                  checkLogin(socket);
  
                  await setSettings("general", data);
                  exports.entryPage = data.entryPage;
  
                  callback({
                      ok: true,
                      msg: "Saved"
                  });
  
                  sendInfo(socket);
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          // Add or Edit
          socket.on("addNotification", async (notification, notificationID, callback) => {
              try {
                  checkLogin(socket);
  
                  let notificationBean = await Notification.save(notification, notificationID, socket.userID);
                  await sendNotificationList(socket);
  
                  callback({
                      ok: true,
                      msg: "Saved",
                      id: notificationBean.id,
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("deleteNotification", async (notificationID, callback) => {
              try {
                  checkLogin(socket);
  
                  await Notification.delete(notificationID, socket.userID);
                  await sendNotificationList(socket);
  
                  callback({
                      ok: true,
                      msg: "Deleted",
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("testNotification", async (notification, callback) => {
              try {
                  checkLogin(socket);
  
                  let msg = await Notification.send(notification, notification.name + " Testing");
  
                  callback({
                      ok: true,
                      msg,
                  });
  
              } catch (e) {
                  console.error(e);
  
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("checkApprise", async (callback) => {
              try {
                  checkLogin(socket);
                  callback(Notification.checkApprise());
              } catch (e) {
                  callback(false);
              }
          });
  
          socket.on("uploadBackup", async (uploadedJSON, importHandle, callback) => {
              try {
                  checkLogin(socket);
  
                  let backupData = JSON.parse(uploadedJSON);
  
                  console.log(`Importing Backup, User ID: ${socket.userID}, Version: ${backupData.version}`);
  
                  let notificationListData = backupData.notificationList;
                  let monitorListData = backupData.monitorList;
  
                  let version17x = compareVersions.compare(backupData.version, "1.7.0", ">=");
  
                  // If the import option is "overwrite" it'll clear most of the tables, except "settings" and "user"
                  if (importHandle == "overwrite") {
                      // Stops every monitor first, so it doesn't execute any heartbeat while importing
                      for (let id in monitorList) {
                          let monitor = monitorList[id];
                          await monitor.stop();
                      }
                      await R.exec("DELETE FROM heartbeat");
                      await R.exec("DELETE FROM monitor_notification");
                      await R.exec("DELETE FROM monitor_tls_info");
                      await R.exec("DELETE FROM notification");
                      await R.exec("DELETE FROM monitor_tag");
                      await R.exec("DELETE FROM tag");
                      await R.exec("DELETE FROM monitor");
                  }
  
                  // Only starts importing if the backup file contains at least one notification
                  if (notificationListData.length >= 1) {
                      // Get every existing notification name and puts them in one simple string
                      let notificationNameList = await R.getAll("SELECT name FROM notification");
                      let notificationNameListString = JSON.stringify(notificationNameList);
  
                      for (let i = 0; i < notificationListData.length; i++) {
                          // Only starts importing the notification if the import option is "overwrite", "keep" or "skip" but the notification doesn't exists
                          if ((importHandle == "skip" && notificationNameListString.includes(notificationListData[i].name) == false) || importHandle == "keep" || importHandle == "overwrite") {
  
                              let notification = JSON.parse(notificationListData[i].config);
                              await Notification.save(notification, null, socket.userID);
  
                          }
                      }
                  }
  
                  // Only starts importing if the backup file contains at least one monitor
                  if (monitorListData.length >= 1) {
                      // Get every existing monitor name and puts them in one simple string
                      let monitorNameList = await R.getAll("SELECT name FROM monitor");
                      let monitorNameListString = JSON.stringify(monitorNameList);
  
                      for (let i = 0; i < monitorListData.length; i++) {
                          // Only starts importing the monitor if the import option is "overwrite", "keep" or "skip" but the notification doesn't exists
                          if ((importHandle == "skip" && monitorNameListString.includes(monitorListData[i].name) == false) || importHandle == "keep" || importHandle == "overwrite") {
  
                              // Define in here every new variable for monitors which where implemented after the first version of the Import/Export function (1.6.0)
                              // --- Start ---
  
                              // Define default values
                              let retryInterval = 0;
  
                              /*
                              Only replace the default value with the backup file data for the specific version, where it appears the first time
                              More information about that where "let version" will be defined
                              */
                              if (version17x) {
                                  retryInterval = monitorListData[i].retryInterval;
                              }
  
                              // --- End ---
  
                              let monitor = {
                                  // Define the new variable from earlier here
                                  name: monitorListData[i].name,
                                  type: monitorListData[i].type,
                                  url: monitorListData[i].url,
                                  method: monitorListData[i].method || "GET",
                                  body: monitorListData[i].body,
                                  headers: monitorListData[i].headers,
                                  interval: monitorListData[i].interval,
                                  retryInterval: retryInterval,
                                  hostname: monitorListData[i].hostname,
                                  maxretries: monitorListData[i].maxretries,
                                  port: monitorListData[i].port,
                                  keyword: monitorListData[i].keyword,
                                  ignoreTls: monitorListData[i].ignoreTls,
                                  upsideDown: monitorListData[i].upsideDown,
                                  maxredirects: monitorListData[i].maxredirects,
                                  accepted_statuscodes: monitorListData[i].accepted_statuscodes,
                                  dns_resolve_type: monitorListData[i].dns_resolve_type,
                                  dns_resolve_server: monitorListData[i].dns_resolve_server,
                                  notificationIDList: {},
                              };
  
                              if (monitorListData[i].pushToken) {
                                  monitor.pushToken = monitorListData[i].pushToken;
                              }
  
                              let bean = R.dispense("monitor");
  
                              let notificationIDList = monitor.notificationIDList;
                              delete monitor.notificationIDList;
  
                              monitor.accepted_statuscodes_json = JSON.stringify(monitor.accepted_statuscodes);
                              delete monitor.accepted_statuscodes;
  
                              bean.import(monitor);
                              bean.user_id = socket.userID;
                              await R.store(bean);
  
                              // Only for backup files with the version 1.7.0 or higher, since there was the tag feature implemented
                              if (version17x) {
                                  // Only import if the specific monitor has tags assigned
                                  for (const oldTag of monitorListData[i].tags) {
  
                                      // Check if tag already exists and get data ->
                                      let tag = await R.findOne("tag", " name = ?", [
                                          oldTag.name,
                                      ]);
  
                                      let tagId;
                                      if (! tag) {
                                          // -> If it doesn't exist, create new tag from backup file
                                          let beanTag = R.dispense("tag");
                                          beanTag.name = oldTag.name;
                                          beanTag.color = oldTag.color;
                                          await R.store(beanTag);
  
                                          tagId = beanTag.id;
                                      } else {
                                          // -> If it already exist, set tagId to value from database
                                          tagId = tag.id;
                                      }
  
                                      // Assign the new created tag to the monitor
                                      await R.exec("INSERT INTO monitor_tag (tag_id, monitor_id, value) VALUES (?, ?, ?)", [
                                          tagId,
                                          bean.id,
                                          oldTag.value,
                                      ]);
  
                                  }
                              }
  
                              await updateMonitorNotification(bean.id, notificationIDList);
  
                              // If monitor was active start it immediately, otherwise pause it
                              if (monitorListData[i].active == 1) {
                                  await startMonitor(socket.userID, bean.id);
                              } else {
                                  await pauseMonitor(socket.userID, bean.id);
                              }
  
                          }
                      }
  
                      await sendNotificationList(socket);
                      await sendMonitorList(socket);
                  }
  
                  callback({
                      ok: true,
                      msg: "Backup successfully restored.",
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("clearEvents", async (monitorID, callback) => {
              try {
                  checkLogin(socket);
  
                  console.log(`Clear Events Monitor: ${monitorID} User ID: ${socket.userID}`);
  
                  await R.exec("UPDATE heartbeat SET msg = ?, important = ? WHERE monitor_id = ? ", [
                      "",
                      "0",
                      monitorID,
                  ]);
  
                  await sendImportantHeartbeatList(socket, monitorID, true, true);
  
                  callback({
                      ok: true,
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("clearHeartbeats", async (monitorID, callback) => {
              try {
                  checkLogin(socket);
  
                  console.log(`Clear Heartbeats Monitor: ${monitorID} User ID: ${socket.userID}`);
  
                  await R.exec("DELETE FROM heartbeat WHERE monitor_id = ?", [
                      monitorID
                  ]);
  
                  await sendHeartbeatList(socket, monitorID, true, true);
  
                  callback({
                      ok: true,
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          socket.on("clearStatistics", async (callback) => {
              try {
                  checkLogin(socket);
  
                  console.log(`Clear Statistics User ID: ${socket.userID}`);
  
                  await R.exec("DELETE FROM heartbeat");
  
                  callback({
                      ok: true,
                  });
  
              } catch (e) {
                  callback({
                      ok: false,
                      msg: e.message,
                  });
              }
          });
  
          // Status Page Socket Handler for admin only
          statusPageSocketHandler(socket);
  
          debug("added all socket handlers");
  
          // ***************************
          // Better do anything after added all socket handlers here
          // ***************************
  
          debug("check auto login");
          if (await setting("disableAuth")) {
              console.log("Disabled Auth: auto login to admin");
              afterLogin(socket, await R.findOne("user"));
              socket.emit("autoLogin");
          } else {
              debug("need auth");
          }
  
      });
  
      console.log("Init the server");
  
      server.once("error", async (err) => {
          console.error("Cannot listen: " + err.message);
          await Database.close();
      });
  
      server.listen(port, hostname, () => {
          if (hostname) {
              console.log(`Listening on ${hostname}:${port}`);
          } else {
              console.log(`Listening on ${port}`);
          }
          startMonitors();
          checkVersion.startInterval();
  
          if (testMode) {
              startUnitTest();
          }
      });
  
      initBackgroundJobs(args);
  
  })();
  
  async function updateMonitorNotification(monitorID, notificationIDList) {
      await R.exec("DELETE FROM monitor_notification WHERE monitor_id = ? ", [
          monitorID,
      ]);
  
      for (let notificationID in notificationIDList) {
          if (notificationIDList[notificationID]) {
              let relation = R.dispense("monitor_notification");
              relation.monitor_id = monitorID;
              relation.notification_id = notificationID;
              await R.store(relation);
          }
      }
  }
  
  async function checkOwner(userID, monitorID) {
      let row = await R.getRow("SELECT id FROM monitor WHERE id = ? AND user_id = ? ", [
          monitorID,
          userID,
      ]);
  
      if (! row) {
          throw new Error("You do not own this monitor.");
      }
  }
  
  async function sendMonitorList(socket) {
      let list = await getMonitorJSONList(socket.userID);
      io.to(socket.userID).emit("monitorList", list);
      return list;
  }
  
  async function afterLogin(socket, user) {
      socket.userID = user.id;
      socket.join(user.id);
  
      let monitorList = await sendMonitorList(socket);
      sendNotificationList(socket);
  
      await sleep(500);
  
      for (let monitorID in monitorList) {
          await sendHeartbeatList(socket, monitorID);
      }
  
      for (let monitorID in monitorList) {
          await sendImportantHeartbeatList(socket, monitorID);
      }
  
      for (let monitorID in monitorList) {
          await Monitor.sendStats(io, monitorID, user.id);
      }
  }
  
  async function getMonitorJSONList(userID) {
      let result = {};
  
      let monitorList = await R.find("monitor", " user_id = ? ORDER BY weight DESC, name", [
          userID,
      ]);
  
      for (let monitor of monitorList) {
          result[monitor.id] = await monitor.toJSON();
      }
  
      return result;
  }
  
  async function initDatabase() {
      if (! fs.existsSync(Database.path)) {
          console.log("Copying Database");
          fs.copyFileSync(Database.templatePath, Database.path);
      }
  
      console.log("Connecting to the Database");
      await Database.connect();
      console.log("Connected");
  
      // Patch the database
      await Database.patch();
  
      let jwtSecretBean = await R.findOne("setting", " `key` = ? ", [
          "jwtSecret",
      ]);
  
      if (! jwtSecretBean) {
          console.log("JWT secret is not found, generate one.");
          jwtSecretBean = await initJWTSecret();
          console.log("Stored JWT secret into database");
      } else {
          console.log("Load JWT secret from database.");
      }
  
      // If there is no record in user table, it is a new Uptime Kuma instance, need to setup
      if ((await R.count("user")) === 0) {
          console.log("No user, need setup");
          needSetup = true;
      }
  
      jwtSecret = jwtSecretBean.value;
  }
  
  async function startMonitor(userID, monitorID) {
      await checkOwner(userID, monitorID);
  
      console.log(`Resume Monitor: ${monitorID} User ID: ${userID}`);
  
      await R.exec("UPDATE monitor SET active = 1 WHERE id = ? AND user_id = ? ", [
          monitorID,
          userID,
      ]);
  
      let monitor = await R.findOne("monitor", " id = ? ", [
          monitorID,
      ]);
  
      if (monitor.id in monitorList) {
          monitorList[monitor.id].stop();
      }
  
      monitorList[monitor.id] = monitor;
      monitor.start(io);
  }
  
  async function restartMonitor(userID, monitorID) {
      return await startMonitor(userID, monitorID);
  }
  
  async function pauseMonitor(userID, monitorID) {
      await checkOwner(userID, monitorID);
  
      console.log(`Pause Monitor: ${monitorID} User ID: ${userID}`);
  
      await R.exec("UPDATE monitor SET active = 0 WHERE id = ? AND user_id = ? ", [
          monitorID,
          userID,
      ]);
  
      if (monitorID in monitorList) {
          monitorList[monitorID].stop();
      }
  }
  
  /**
   * Resume active monitors
   */
  async function startMonitors() {
      let list = await R.find("monitor", " active = 1 ");
  
      for (let monitor of list) {
          monitorList[monitor.id] = monitor;
      }
  
      for (let monitor of list) {
          monitor.start(io);
          // Give some delays, so all monitors won't make request at the same moment when just start the server.
          await sleep(getRandomInt(300, 1000));
      }
  }
  
  async function shutdownFunction(signal) {
      console.log("Shutdown requested");
      console.log("Called signal: " + signal);
  
      console.log("Stopping all monitors");
      for (let id in monitorList) {
          let monitor = monitorList[id];
          monitor.stop();
      }
      await sleep(2000);
      await Database.close();
  }
  
  function finalFunction() {
      console.log("Graceful shutdown successful!");
  }
  
  gracefulShutdown(server, {
      signals: "SIGINT SIGTERM",
      timeout: 30000,                   // timeout: 30 secs
      development: false,               // not in dev mode
      forceExit: true,                  // triggers process.exit() at the end of shutdown process
      onShutdown: shutdownFunction,     // shutdown function (async) - e.g. for cleanup DB, ...
      finally: finalFunction,            // finally function (sync) - e.g. for logging
  });
  
  // Catch unexpected errors here
  process.addListener("unhandledRejection", (error, promise) => {
      console.trace(error);
      console.error("If you keep encountering errors, please report to https://github.com/louislam/uptime-kuma/issues");
  });
  