middleware.js

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

module.exports.isloggedin = (req , res , next) => {
if(!req.isAuthenticated()){
  req.session.returnTo = req.originalUrl;
    req.flash("error" , "You must be signed in first")
    return res.redirect("/login")
  }
  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.isAuthor = async (req , res , next ) => {
  const {id} = req.params;
  const campground = await Campground.findById(req.params.id).populate("reviews").populate("author");
  if( !campground.author.equals(req.user._id)) {
    req.flash("error" , "you dont have permission to do that!")
    return res.redirect(`/campgrounds/${id}`);
  }
  next();
}

module.exports.validateReview = (req , res , next) => {
  const { error } = reviewSchema.validateAsync(req.body);
  if (error) {
    const msg = error.details.map((el) => el.message).join(",");
    throw new ExpressError(msg, 400);
  } else {
    next();
  }
}

module.exports.isReviewAuthor = async (req , res , next ) => {
  const { id , reviewId} = req.params;
  const review = await Review.findById(reviewId)
  if( !review.author.equals(req.user._id)) {
    req.flash("error" , "you dont have permission to do that!")
    return res.redirect(`/campgrounds/${id}`);
  }
  next();
}