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()){
        if (req.method !== "GET") {
            const { id } = req.params;
            req.session.redirectUrl = id ? `/listings/${id}` : '/listings';
        } else {
            req.session.redirectUrl = req.originalUrl;
        }
        req.flash('error', 'You must be logged In!');
        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(!res.locals.currUser._id.equals(listing.owner._id)){
        req.flash("error", "You are not a owner of this listing!");
        return res.redirect(`/listings/${id}`);
    }
    next();
}

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

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

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