MiddleWare.js

const Listing = require("./models/listing");
const Review = require("./models/review.js");
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 log in use this option.");
            return res.redirect("/login");
      }
      next();
}

module.exports.saveRedirectUrl = (req, res , next)=>{
      if (req.session.redirectUrl) {
            res.locals.redirectUrl = req.session.redirectUrl;
            console.log(res.locals.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.curUser._id)) {
            req.flash("error" , "You are not owner of this listing.");
            return res.redirect(`/listings/${id}`);
      }

      next();
}

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

module.exports.validateReview = (req , res , next) =>{
      const {error} = reviewSchema.validate(req.body);
      // console.log(result);
      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.curUser._id)) {
            req.flash("error" , "You are not author of this review.");
            return res.redirect(`/listings/${id}`);
      }

      next();
}