middleware.js

const Listing = require('./models/listing');
const Review = require('./models/review');
const expressError = require("./utils/expressError");
const { listingSchema, reviewSchema } = require("./schema.js");

module.exports.isLoggedIn = (req, res, next) => {
    if (!req.isAuthenticated()) {
        req.session.redirectUrl = req.originalUrl;
        req.flash('error', 'You must be signed in first!');
        return res.redirect('/login');
    }
    next();
};

module.exports.saveRedirectUrl = (req, res, next) => {
    if(req.session.redirectUrl) {
        res.locals.redirectUrl = req.session.originalUrl;
    }
    next();
};

module.exports.isOwner = async (req, res, next) => {
    let { id } = req.params;
    let listing = await Listing.findById(id);
    if (!listing.owner.equals(res.locals.currUser._id)) {
        req.flash('error', 'You are not the owner of the listing');
        return res.redirect(`/listings/${id}`);
    }
    next();
};

module.exports.validateListing = (req, res, next) => {
    let {error} = listingSchema.validate(req.body);
    if(error){
        let errMsg = error.details.map(el => el.message).join(",");
        throw new expressError(400, errMsg);
    }else{
        next();
    }
}

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

module.exports.isReviewAuthor = async (req, res, next) => {
    let { id, reviewId } = req.params;
    let review = await Review.findById(reviewId);
    if (!review.author.equals(res.locals.currUser._id)) {
        req.flash('error', 'You are not the author of the review');
        return res.redirect(`/listings/${id}`);
    }
    next();
};