schemas.js

const BaseJoi=require('joi');
const sanitizeHtml=require('sanitize-html');

const extension = (joi) => ({
    type:'string',
    base:joi.string(),
    messages:{
        'string.escapeHTML':'{{#label}} must not include HTML!'
    },
    rules:{
        escapeHTML:{
            validate(value,helpers) {
                const clean = sanitizeHtml(value, {
                    allowedTags:[],
                    allowedAttributes:{},
                });
                if(clean!==value) return helpers.error('string.escapeHTML',{value})
                return clean;
            }
        }
    }
});

const Joi = BaseJoi.extend(extension)

module.exports.campgroundSchema=Joi.object({
    campground: Joi.object({
        title:Joi.string().required().escapeHTML(),
        price: Joi.number().required().min(0),
        location: Joi.string().required().escapeHTML(),
        description: Joi.string().required().escapeHTML()
    }).required(),
    deleteImages: Joi.array()
});

module.exports.reviewSchema= Joi.object({
    review: Joi.object({
        rating: Joi.number().required().min(1).max(5),
        body: Joi.string().required().escapeHTML()
    }).required()
});