middleware.js

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

// Validating Listing Schema with the help of JOI (server side validation)
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();
    }
}

// Validating Review Schema with the help of JOI (server side validation)
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.isLoggedIn = (req, res, next) => {
    // console.log(req.user);
    if (!req.isAuthenticated()) {
        // console.log("reqOriginal = ",req.originalUrl);
        // console.log("reqParsedUrl = ",req._parsedUrl);
        req.session.redirectUrl = req.originalUrl;
        req.flash("error", "You must be logged in to create listing!");
        return res.redirect('/login');
    }
    next();
};

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

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

    next();
};

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

    next();
};