app.js

const fs = require("fs");
const path = require("path");

const express = require("express");
const bodyParser = require("body-parser");
const mongoose = require("mongoose");
const dotenv = require("dotenv");

const placesRoutes = require("./routes/places-routes");
const usersRoutes = require("./routes/users-routes");
const HttpError = require("./models/http-error");

// Setup support env files for environment variables
dotenv.config();

// Create app (server) to listen to incoming requests
const app = express();

// Setup bodyParser to parse incoming request to JSON format
app.use(bodyParser.json());

// Setup images serving statically
app.use("/uploads/images", express.static(path.join("uploads", "images")));

// Setup headers to handle cors requests
app.use((req, res, next) => {
  res.setHeader("Access-Control-Allow-Origin", "*"); // Open api to all domain
  res.setHeader(
    "Access-Control-Allow-Headers",
    "Origin, X-Requested-With, Content-Type, Accept, Authorization"
  );
  res.setHeader(
    "Access-Control-Allow-Methods",
    "GET, POST, PUT, PATCH, DELETE"
  );
  next();
});

// Setup routes for app
app.use("/api/places", placesRoutes);
app.use("/api/users", usersRoutes);

app.use((req, res, next) => {
  const error = new HttpError("Could not find this route", 404);
  throw error;
});

// Setup defauld error handling middleare using Express
app.use((error, req, res, next) => {
  // Delete file if there are any errors
  if (req.file) {
    fs.unlink(req.file.path, (err) => {
      console.log(err);
    });
  }

  if (res.headerSent) {
    return next(error);
  }

  res.status(error.code || 500);
  res.json({ message: error.message || "An unknown error occurred!" });
});

// Setup db connection and server on port 5000
mongoose
  .connect(
    `mongodb+srv://${process.env.DB_USER}:${process.env.DB_PASSWORD}@cluster0.bkmox.mongodb.net/${process.env.DB_NAME}?retryWrites=true&w=majority`,
    {
      useNewUrlParser: true,
      useUnifiedTopology: true,
      useCreateIndex: true,
      useFindAndModify: false,
    }
  )
  .then(() => {
    app.listen(process.env.PORT || 5000);
  })
  .catch((error) => {
    console.log(error);
  });