middleware.js

const Listing = require("./models/listing");
const Review = require("./models/review");
const ExpressError = require("./utils/ExpressError.js")
const {listingSchema} = require("./schema.js")
const {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 create new 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) => {
    let {id} = req.params
    let listing = await Listing.findById(id)
    if (!listing.owner.equals(res.locals.currUser._id)) {
        req.flash("error","You are not owner of this Listing")
        return res.redirect(`/listings/${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(404,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(404,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 author of this Review")
        return res.redirect(`/listings/${id}`)
    }
    next();
}