object_validate.js

'use strict';

const keys_map = {
	'host': {isRequired: true, type: 'string', min: 3, max: 500},
	'ip': {isRequired: true, type: 'string', min: 1, max: 500},
	'username': {isRequired: true, type: 'string', min: 1, max: 500},
	'updated': {default: function(){return (new Date).getTime()}},
	'targetPort': {isRequired: false, default: 80, type: 'number', min: 0, max: 65535},
	'forcessl': {isRequired: false, default: true, type: 'boolean'},
	'targetssl': {isRequired: false, default: false, type: 'boolean'},
}

const process_type = {
	number: function(key, value){
		if(key.min && value < key.min) return `is to small, min ${key.min}.`
		if(key.max && value > key.max) return `is to large, max ${key.max}.`
	},
	string: function(key, value){
		if(key.min && value.length < key.min) return `is too short, min ${key.min}.`
		if(key.max && value.length > key.max) return `is too short, max ${key.max}.`
	}
}

function returnOrCall(value){
	return typeof(value) === 'function' ? value() : value;
} 

function process_keys(map, data, forceRequired){
	forceRequired = forceRequired === undefined ? true : forceRequired;
	let errors = [];
	let out = {};

	for(let key of Object.keys(map)){
		// console.log(key, data[key], errors)
		if(forceRequired && map[key].isRequired && !data.hasOwnProperty(key)){
			errors.push({key, message:`${key} is required.`});
			continue;
		} 

		if(data.hasOwnProperty(key) && typeof(data[key]) !== map[key].type){
			errors.push({key, message:`${key} is not ${map[key].type} type.`});
			continue;
		}

		if(data.hasOwnProperty(key) && process_type[map[key].type]){
			let typeError = process_type[map[key].type](map[key], data[key]);
			if(typeError){
				errors.push({key, message:`${key} ${typeError}`});
				
				continue;
			}
		}

		out[key] = data.hasOwnProperty(key) ? data[key] : returnOrCall(map[key].default);
	}

	if(errors.length !== 0){
		return {errors}
	}

	return {data: out}
}


console.log('********************************************')
console.log(process_keys(keys_map, {}))
/*
{ errors: 
   [ { key: 'host', message: 'host is required.' },
     { key: 'ip', message: 'ip is required.' },
     { key: 'username', message: 'username is required.' } ] }

*/

console.log('********************************************')
console.log(process_keys(keys_map, {
	host: 'a',
	ip:'asdas',
	username: '',
	targetPort: 100000000
}))
/*
{ errors: 
   [ { key: 'host', message: 'host is too short, min 3.' },
     { key: 'username', message: 'username is too short, min 1.' },
     { key: 'targetPort',
       message: 'targetPort is to large, max 65535.' } ] }

*/

console.log('********************************************')
console.log(process_keys(keys_map, {
	host: 'test.com',
	ip:'127.0.0.',
	username: 'william',
	targetPort: 443
}))
/*
{ data: 
   { host: 'test.com',
     ip: '127.0.0.',
     username: 'william',
     updated: 1576875909163,
     targetPort: 443,
     forcessl: true,
     targetssl: false } }

*/