app.js

if (process.env.NODE_ENV !== "production") {
    require("dotenv").config();
}
const express = require("express");
const path = require("path");
const mongoose = require("mongoose");
const ExpressError = require("./utils/ExpressError");
const methodOverride = require("method-override");
const ejsMate = require("ejs-mate");
const session = require("express-session");
const flash = require("connect-flash");
const MongoDBStore = require("connect-mongo")(session);
const mongoSanitize = require("express-mongo-sanitize"); // for protection against mongo injections
const passport = require("passport");
const LocalStrategy = require("passport-local");
const User = require("./models/user");

// routes
const campgroundRoutes = require("./routes/campgrounds");
const reviewRoutes = require("./routes/reviews");
const userRoutes = require("./routes/users");

// const dbUrl = "mongodb://localhost:27017/yelp-camp--final";
const dbUrl =
    process.env.DB_URL || "mongodb://localhost:27017/yelp-camp--final";

// connecting to mongoose
async function main() {
    await mongoose.connect(dbUrl);
    console.log("Database Connected!");
}
main().catch((err) => console.log("Mongo connection error:", err));

const app = express();

app.engine("ejs", ejsMate);
app.set("view engine", "ejs");
app.set("views", path.join(__dirname, "views"));

app.use(express.urlencoded({ extended: true })); // for body parsing (form data) (req.body)
app.use(express.json());

app.use(express.static(path.join(__dirname, "public")));
app.use(methodOverride("_method"));
app.use(mongoSanitize({ replaceWith: "_" }));

const secret = process.env.SECRET || "thisshouldbeabettersecret!";

// mongo store
const store = new MongoDBStore({
    url: dbUrl,
    secret,
    touchAfter: 24 * 60 * 60,
});

store.on("error", function (e) {
    console.log("SESSION STORE ERROR", e);
});

// session and flash
const sessionConfig = {
    store,
    name: "session",
    secret,
    resave: false,
    saveUninitialized: true,
    cookie: {
        httpOnly: true,
        expires: Date.now() + 1000 * 60 * 60 * 24 * 7,
        maxAge: 1000 * 60 * 60 * 24 * 7,
    },
};
app.use(session(sessionConfig));
app.use(flash());

// passport middlewares
app.use(passport.initialize());
app.use(passport.session());
passport.use(new LocalStrategy(User.authenticate()));
passport.serializeUser(User.serializeUser());
passport.deserializeUser(User.deserializeUser());

// local varaibles middleware
app.use((req, res, next) => {
    res.locals.currentUser = req.user;
    res.locals.success = req.flash("success");
    res.locals.error = req.flash("error");
    next();
});

// route handlers
app.use("/campgrounds", campgroundRoutes);
app.use("/campgrounds/:id/reviews", reviewRoutes);
app.use("/", userRoutes);

// home route
app.get("/", (req, res) => {
    res.render("home");
});

app.get("/api/hello", (req, res) => {
    res.json({ message: "API is up and running" });
});

// 404 catch-all route middleware
app.all("*", (req, res, next) => {
    next(new ExpressError("Page not found!", 404));
});

// express error handler middleware
app.use((err, req, res, next) => {
    const { statusCode = 500 } = err;
    if (!err.message) err.message = "oh no! something went wrong!";
    res.status(statusCode).render("error", { err });
});

const port = process.env.PORT || 4000;
app.listen(port, () => {
    console.log(`server running on port ${port} || http://localhost:${port}`);
});