middleware.js

const Listing = require("./models/listing");
const Review = require("./models/review");
const ExpressError = require("./utils/ExpressError.js");
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 logged in to do that!");
        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) => {
    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 this listing!");
        return res.redirect(`/listings/${listing._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 this review!");
        return res.redirect(`/listings/${id}`);
    }
    next();
};