middleware.js

const { blogSchema, commentSchema } = require('./schemas.js');
const ExpressError = require('./utils/ExpressError');
const Blog = require('./models/blog');
const Comment = require('./models/comment');
const JSAlert = require('js-alert');

module.exports.isLoggedIn = (req, res, next) => {
    if (!req.isAuthenticated()) {
        req.session.returnTo = req.originalUrl
        JSAlert.alert('Please sign in to continue');
        return res.redirect('/login');
    }
    next();
}

module.exports.validateBlog = (req, res, next) => {
    const { error } = blogSchema.validate(req.body, { allowUnknown: true });
    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 blog = await Blog.findById(id);
    if (!blog.author.equals(req.user._id)) {
        JSAlert.alert('You have no permission to do that');
        return res.redirect(`/blogs/${blog._id}`);
    }
    next();
}

module.exports.validateComment = (req, res, next) => {
    const { error } = commentSchema.validate(req.body);
    if (error) {
        const msg = error.details.map(el => el.message).join(',')
        throw new ExpressError(msg, 400)
    } else {
        next();
    }
}

module.exports.isCommentAuthor = async(req, res, next) => {
    const { id, commentId } = req.params;
    const comment = await Comment.findById(commentId);
    if (!comment.author.equals(req.user._id)) {
        JSAlert.alert('You have no permission to do that');
        return res.redirect(`/blogs/${id}`);
    }
    next();
}