letu/app.js

let createError = require("http-errors");
let express = require("express");
let path = require("path");
let cookieParser = require("cookie-parser");
let logger = require("morgan");
let sassMiddleware = require("node-sass-middleware");
const session = require("express-session");
let config = process.env.NODE_ENV === "test" ? {} : require("./config/config.json");

let indexRouter = require("./routes/index");
const loginRouter = require("./routes/login");

let app = express();
const sessionMiddleware = session({
  secret: process.env.NODE_ENV === "test" ? "Keyboard Cat" : config.secret
});

// view engine setup
app.set("views", path.join(__dirname, "views"));
app.set("view engine", "pug");
app.set("sessionMiddleware", sessionMiddleware);
app.set("config", config);

app.use(logger("dev"));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(sassMiddleware({
  src: path.join(__dirname, "public"),
  dest: path.join(__dirname, "public"),
  indentedSyntax: true, // true = .sass and false = .scss
  sourceMap: true
}));
app.use(express.static(path.join(__dirname, "public")));
app.use(sessionMiddleware);
app.use((req, res, next) => {
  res.locals.session = req.session;
  next();
});

app.use("/", indexRouter);
app.use("/login", loginRouter);

// catch 404 and forward to error handler
app.use((req, res, next) => {
  next(createError(404));
});

// error handler
app.use((err, req, res) => {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get("env") === "development" ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render("error");
});

module.exports = app;