middleware.js

const { homestaySchema, reviewSchema } = require("./schemas");
const ExpressError = require('./utils/ExpressError');
const Homestay = require('./models/homestay');
const Review = require('./models/review');

module.exports.isLoggedIn = (req, res, next) => {
    // store the url which is requesting
    if(!req.isAuthenticated()){
        // console.log(req.session);
        req.flash('error', 'Please sign in!');
        // redirect to the url we stored before
        return res.redirect('/login');
    }
    next();
}

module.exports.validateHomestay = (req, res, next) => {
    const { error } = homestaySchema.validate(req.body);
    if(error){
        const msg = error.details.map(el => el.message).join(",");
        throw new ExpressError(msg, 400);
    } else {
        next();
    }
}

module.exports.isAuthor = async(req, res, next) => {
    const { id } = req.params;
    const homestay = await Homestay.findById(id);
    if(!homestay.author.equals(req.user._id)){
        req.flash('error', 'You do not have permission to do that!');
        return res.redirect(`/homestay/${id}`);
    }
    next();
}

module.exports.validateReview = (req, res, next) => {
    const { error } = reviewSchema.validate(req.body);
    if(error){
        const msg = error.details.map(el => el.message).join(",");
        throw new ExpressError(msg, 400);
    } else {
        next();
    }
}

module.exports.isReviewAuthor = async(req, res, next) => {
    const { id, reviewId } = req.params;
    const review = await Review.findById(reviewId);
    if(!review.author.equals(req.user._id)){
        req.flash('error', 'You do not have permission to do that!');
        return res.redirect(`/homestay/${id}`);
    }
    next();
}