middleware.js

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


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

module.exports.isAuthor = async (req, res, next) => {
    const { id } = req.params;
    const camp = await Campground.findById(id);
    if (camp && camp.author.equals(req.user._id)) {
        next();
    }
    else {
        req.flash("error", "You are not authorised to do that")
        res.redirect(`/campgrounds/${id}`);
    }
}

module.exports.isReviewAuthor = async (req, res, next) => {
    const { id, reviewId } = req.params;
    const review = await Review.findById(reviewId);
    if (review && review.author.equals(req.user._id)) {
        next();
    }
    else {
        req.flash("error", "You are not authorised to do that")
        res.redirect(`/campgrounds/${id}`);
    }
}

module.exports.validateCampgrounds = (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.validateReviews = (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();
    }
};