middleware.js

// <<<<<<<<<< requires <<<<<<<<<<
const Listing = require("./models/listing.js");
const Review = require("./models/review.js");
const ExpressError = require("./utils/ExpressError.js");
const { listingSchema, reviewSchema } = require("./schema.js");

// ========== loging ==========
module.exports.isLoggedIn = (req, res, next) => {
    if(!req.isAuthenticated()){
        req.session.redirectUrl = req.originalUrl;
        req.flash("error", "you must be logged in to create listing!");
        return res.redirect("/login");
    } 
    next();
}

// :::::::::: redirect ::::::::::
module.exports.saveRedirectUrl = (req, res, next) =>{
    if(req.session.redirectUrl){
        res.locals.redirectUrl = req.session.redirectUrl;
    }
    next();
};

// ########## owner ########## 
module.exports.isOwner = async(req, res, next) =>{
    let { id } = req.params;
    let listing = await Listing.findById(id);
    if(!listing.owner._id.equals(res.locals.currUser._id)){
        req.flash("error", "You are not the owner of this listing   ");
        return res.redirect(`/listings/${id}`);
    }
    next();
};

// ********** listing_validations_server_side **********
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(400, errMsg);
    }else{
        next();
    }
};

// ---------- review_validations_server_side ----------
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(400, errMsg);
    }else{
        next();
    }
};

// >>>>>>>>>> review_author >>>>>>>>>>
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 the author of this review");
        return res.redirect(`/listings/${id}`);
    }
    next();
};