middleware.js

const ExpressError = require("./utils/ExpressError.js");
const { campgroundSchema, reviewSchema } = require('./schemas.js');
const Campground = require('./models/campground');
const Review = require('./models/review.js');

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


module.exports.validateCampground = (req, res, next) => {
    const { error } = campgroundSchema.validate(req.body);
    if (error) {
        const msg = error.details.map(el => el.message).join(', ');
        throw new ExpressError(msg, 400);
    } else
        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.isAuthor = async (req, res, next) => {
    const { id } = req.params;
    const campground = await Campground.findById(id);
    if (!campground.author.equals(req.user._id)) {
        req.flash('error', 'You do not have permission to do that!');
        return res.redirect(`/campgrounds/${id}`);
    }
    next();
}

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